Only analyze files that are children of the targets in build()

[devdanzin]

When building, wily creates lists of target files to scan based on added and modified files from the git repository. It's possible to pass a path to wily build, but it won't currently avoid scanning files outside of the path.

This PR makes wily only scan files that are children of the chosen path during build. This is an improvement for building in repositories that contains large files that aren't interesting to analyze. The behavior remains unchanged if no path is passed to wily build.

This addresses a TODO in build.py, adapting some commented out code:

wily/src/wily/commands/build.py

Line 103 in 2590691

# TODO : Check that changed files are children of the targets

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.81%. Comparing base (2590691) to head (4761779).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #225      +/-   ##
==========================================
- Coverage   95.86%   94.81%   -1.06%     
==========================================
  Files          25       25              
  Lines        1403     1407       +4     
  Branches      296      297       +1     
==========================================
- Hits         1345     1334      -11     
- Misses         33       48      +15     
  Partials       25       25              

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