Boggart

Fixes

* fixed a bad logging call in `Client.mutations_to_diff` that led to crashing.

Features

* added FileLine data structure
* added additional functionality to SourceFileManager
* refactored location module to use attrs

Changes

* updated default mutation operators

Bug Fixes

* added missing semi-colon to `undo-transformation` match template
* fixed typo in unexpected error handling code in server module
* fixed off-by-one error in `SourceFileManager.line_col_to_offset`
* fixed off-by-one error in `SourceFileManager.apply`

Improvements

* added test cases for `SourceFileManager.line_col_to_offset` and `SourceFileManager.apply`
* added `__repr__` to all data structures
* added convenience functions for computing diffs
* added `mutations_to_diff` to client

* fixed a bug in mutation calculation: collect results of generator to a list.
* added better handling of unexpected server errors.

* fixed code to comply with PEP8
* added extensive logging
* fixed bug in `GET /mutations` routing
* fixed bad keyword argument
* added useful functions for systems testing

* added Rooibos integration