Git hooks broken on Windows

[grantjbutler]

For some reason, git hooks don't run on Windows. Trying to run them yields the error /usr/bin/env: ‘bash’: No such file or directory. I'm not entirely sure what's trying to run in this manner, as that's the whole error message. For the time being, we may have to disable git hooks until we can figure out how to get them properly working on Windows.