Izy

Major new features:
* Simple `Table` class for handling small tabular data
* `Path`, `FilePath`, `TempFilePath` classes for path/file operations
* Helper functions for making, using regular expressions
* The `head()` function for discovering complex data structures
* `misc` module containing:
* `Singleton` metaclass
* function to `flatten` 2d nested iterables
* the `unique` function to `remove_dups`
* the `setup_logger` function

Minor changes:
* change behavior of `best()`, `topk()` methods of the `Scorer` class

Added `Bidict` (simple, easy-to-use bidirectuinal dict) + some minor updates:
* Changed behavior of `reorder()` for some iterables
* Added `ordered()` as an alternative to built-in `sorted()`
* Minor change to signature and behavior of `returns`, `yields`

**Full Changelog**: https://github.com/tabasy/izy/compare/v0.1.3...v0.2.0

Fixed problem with older versions of python

Added useful tools in 3 categories:
* sorting functions (argsort, argmin, argmax, topk, etc.)
* Scorer class (generalizing python Counter to float and negative values)
* decorators (exception handling, logging, etc.)