Git module creation

[alejgh]

Implementation of the git module. This module will handle the data received from the GitHub WebHooks to load the diff from the push, and process the information so it can be used later on by other modules. The information returned by the module is as follows:

• List of added files.
• List of removed files.
• List of modified files.

For each file, the following information can be accessed:

• Original content of the file before the push.
• Final content of the file after the push.
• Lines added (line content and line number in the file).
• Lines removed (line content and line number in the file).

The files are loaded lazily using a generator to avoid memory overheads.

[codecov-io]

Codecov Report

Merging #8 into master will decrease coverage by 0.79%. The diff coverage is 88.23%.

@@            Coverage Diff            @@
##           master       #8     +/-   ##
=========================================
- Coverage   89.47%   88.67%   -0.8%     
=========================================
  Files           2        3      +1     
  Lines          57      159    +102     
=========================================
+ Hits           51      141     +90     
- Misses          6       18     +12

Impacted Files	Coverage Δ
hercules_sync/git.py	88.23% <88.23%> (ø)

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