test: normalize paths and subprocess for win compat for #81

[noahnu]

Windows Compatibility for Testing

Addresses #81 (at least to get tests to pass as a first step).

• Wraps mock paths in os.path normalize case function which will convert forward slashes to backward slashes on Windows environments.
• use direct path to codewatch bin and manually specifies python executable since Windows does not support the shebang directive on executable scripts

TODO

• [x] Test on Mac
• [x] Fix linting (python issues on my windows so switching to Mac to clean this up)

[codecov[bot]]

Codecov Report

Merging #82 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #82   +/-   ##
=======================================
  Coverage   96.39%   96.39%           
=======================================
  Files           8        8           
  Lines         333      333           
  Branches       46       46           
=======================================
  Hits          321      321           
  Misses          6        6           
  Partials        6        6

Flag	Coverage Δ
#py27	96.39% <ø> (ø)	:arrow_up:
#py36	96.39% <ø> (ø)	:arrow_up:
#py37	96.39% <ø> (ø)	:arrow_up:

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