Agate

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* Add many missing unit tests. Up to 99% coverage.
* Add property accessors for TableSet.key_name and TableSet.key_type. (247)
* Table.rows and Table.columns are now behind properties. (247)
* Column.data_type is now a property. (247)
* Table[Set].get_column_types() is now the Table[Set].column_types property. (247)
* Table[Set].get_column_names() is now the Table[Set].column_names property. (247)
* Table.pretty_print now displays consistent decimal places for each Number column.
* Discrete data types (Number, Date etc) are now right-aligned in Table.pretty_print.
* Implement aggregation result caching. (245)
* Reimplement Percentiles, Quartiles, etc as aggregations.
* UnsupportedAggregationError is now used to disable TableSet aggregations.
* Replaced several exceptions with more general DataTypeError.
* Column type information can now be accessed as Column.data_type.
* Eliminated Column subclasses. Restructured around DataType classes.
* Table.merge implemented. (9)
* Cookbook: guess column types. (230)
* Fix issue where all group keys were being cast to text. (235)
* Table.group_by will now default key_type to the type of the grouping column. (234)
* Add Matt Riggott to AUTHORS. (231)
* Support file-like objects in Table.to_csv and Table.from_csv. (229)
* Fix bug when applying multiple computations with Table.compute.

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* Cookbook: dealing with locales. (220)
* Cookbook: working with dates and times.
* Add timezone support to DateTimeType.
* Use pytimeparse instead of python-dateutil. (221)
* Handle percents and currency symbols when casting numbers. (217)
* Table.format is now Table.pretty_print. (223)
* Rename TextType to Text, NumberType to Number, etc.
* Rename agate.ColumnType to agate.DataType (216)
* Rename agate.column_types to agate.data_types.
* Implement locale support for number parsing. (116)
* Cookbook: ranking. (110)
* Cookbook: date change and date ranking. (113)
* Add tests for unicode support. (138)
* Fix computations.ZScores calculation. (123)
* Differentiate sample and population variance and stdev. (208)
* Support for overriding column inference with "force".
* Competition ranking implemented as default. (125)
* TypeTester: robust type inference. (210)

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* Cookbook: USA Today diversity index.
* Cookbook: filter to top x%. (47)
* Cookbook: fuzzy string search example. (176)
* Values to coerce to true/false can now be overridden for BooleanType.
* Values to coerce to null can now be overridden for all ColumnType subclasses. (206)
* Add key_type argument to TableSet and Table.group_by. (205)
* Nested TableSet's and multi-dimensional aggregates. (204)
* TableSet.aggregate will now use key_name as the group column name. (203)
* Added key_name argument to TableSet and Table.group_by.
* Added Length aggregation and removed count from TableSet.aggregate output. (203)
* Fix error messages for RowDoesNotExistError and ColumnDoesNotExistError.

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* Fix missing package definition in setup.py.
* Split Analysis off into the proof library.
* Change computation now works with DateType, DateTimeType and TimeDeltaType. (159)
* TimeDeltaType and TimeDeltaColumn implemented.
* NonNullAggregation class removed.
* Some private Column methods made public. (183)
* Rename agate.aggegators to agate.aggregations.
* TableSet.to_csv implemented. (195)
* TableSet.from_csv implemented. (194)
* Table.to_csv implemented (169)
* Table.from_csv implemented. (168)
* Added Table.format method for pretty-printing tables. (191)
* Analysis class now implements a caching workflow. (171)

-----------------------

* Table now takes (column_name, column_type) pairs. (180)
* Renamed the library to agate. (179)
* Results of common column operations are now cached using a common memoize decorator. (162)
* ated support for Python version 3.2.
* Added support for Python wheel packaging. (127)
* Add PercentileRank computation and usage example to cookbook. (152)
* Add indexed change example to cookbook. (151)
* Add annual change example to cookbook. (150)
* Column.aggregate now invokes Aggregations.
* Column.any, NumberColumn.sum, etc. converted to Aggregations.
* Implement Aggregation and subclasses. (155)
* Move ColumnType subclasses and ColumnOperation subclasses into new modules.
* Table.percent_change, Table.rank and Table.zscores reimplemented as Computers.
* Computer implemented. Table.compute reimplemented. (147)
* NumberColumn.iqr (inter-quartile range) implemented. (102)
* Remove Column.counts as it is not the best way.
* Implement ColumnOperation and subclasses.
* Table.aggregate migrated to TableSet.aggregate.
* Table.group_by now supports grouping by a key function. (140)
* NumberColumn.deciles implemented.
* NumberColumn.quintiles implemented. (46)
* NumberColumn.quartiles implemented. (45)
* Added robust test case for NumberColumn.percentiles. (129)
* NumberColumn.percentiles reimplemented using new method. (130)
* Reorganized and modularized column implementations.
* Table.group_by now returns a TableSet.
* Implement TableSet object. (141)

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* Upgrade to python-dateutil 2.2. (134)
* Wrote introductory tutorial. (133)
* Reorganize documentation (132)
* Add John Heasly to AUTHORS.
* Implement percentile. (35)
* no_null_computations now accepts args. (122)
* Table.z_scores implemented. (123)
* DateTimeColumn implemented. (23)
* Column.counts now returns dict instead of Table. (109)
* ColumnType.create_column renamed _create_column. (118)
* Added Mick O'Brien to AUTHORS. (121)
* Pearson correlation implemented. (103)