Suppress the error if we can't locate ssh-add
Better handling of clean-up during Sublime Text alias setup in PoSh
Merge branch 'master' of github.com:ralish/dotfiles

* 'master' of github.com:ralish/dotfiles:
  Also bail out of SetupEnv if we detect we're running under MinGW
  Immediately bail out if we're running under Cygwin