support running in Git Bash on Windows

[nobodyiam]

No description provided.

[coveralls]

Coverage remained the same at 50.059% when pulling bca2f6d on nobodyiam:fix-windows-startup into 041de90 on ctripcorp:master.

[codecov-io]

Codecov Report

Merging #625 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             master    #625   +/-   ##
========================================
  Coverage      46.5%   46.5%           
  Complexity     1469    1469           
========================================
  Files           341     341           
  Lines          9373    9373           
  Branches        927     927           
========================================
  Hits           4359    4359           
  Misses         4682    4682           
  Partials        332     332

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