Goldilocks

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* Officially add MIT license to repository.
* Deprecate `_filter`.
* Update and tidy `examples.py`.
* `is_seq` argument to initialisation removed and replaced with `is_pos`.
* Use `is_pos` to indicate the expected input is positional, not sequence.
* Force use of `PositionCounterStrategy` when `is_pos` is True.
* Sequence data now read in to 0-indexed arrays to avoid the overhead of string
re-allocation by having to append a padding character to the beginning of very
long strings.
* Region metadata continues to use 1-indexed positions for user output.
* `VariantCounterStrategy` now `PositionCounterStrategy`.
* `PositionCounterStrategy` expects 1-indexed lists of positions;
`prepare` populates the listed locations with 1 and then `evaluate`
returns the sum as before.
* `test_regression2` updated to account for converting 1-index to 0-index when
manually handling the sequence for expected results.
* `query` accepts `gmax` and `gmin` arguments to filter candidate regions by
the group-track value.
* `CandidateList` removed and replaced with simply returning a new `Goldilocks`.

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* `Goldilocks.sorted_regions` stores a list of region ids to represent the result
of a sorting operation following a call to `query`.
* Regions in `Goldilocks.regions` now always have a copy of their "id" as a key.
* `__check_exclusions` now accepts a `group` and `track` for more complex
exclusion-based operations.
* `region_group_lte` and `region_group_gte` added to usable exclusion fields to
remove regions where the value of the desired group/track combination is
less/greater than or equal to the value of the group/track set by the
current `query`.
* `query` now returns a new `Goldilocks` instance, rather than a `CandidateList`.
* `Goldilocks.candidates` property now allows access to regions, this property
will maintain the order of `sorted_regions` if it has one.
* `export_meta` now allows `group=None`
* `CandidateList` class deleted.
* Test data that is no longer used has been deleted.
* Scripts for generating test data added to `test_gen/` directory.
* Tests updated to reflect the fact `CandidateList` lists are no longer returned
by `query`.
* `_filter` is to be deprecated in favour of `query` by 0.0.7

Beta (2014-10-08)
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* Massively updated! Compatability with previous versions very broken.
* Software retrofitted to be much more flexible to support a wider range of problems.

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* Remove incompatible use of `print`

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* Initial package