Replace backslashes with forward slashes

This fixes the file URL on a windows machine.
Adjust gruntfile paths for Win32
Add win32-specific bootstrap task and scripts

Symlinking requires admin access on Win32 and this works around that by
running the shell directly against the app source. The bootstrap-win
grunt task also doesn't need to generate a plist.

The powershell scripts will automatically run on Windows from a
powershell prompt without requiring the developer to type the extension.
Merge branch 'win32-dev-adjustments'
Merge branch 'win32-url-path-fix'