Escape backslashes when that's the path separator

This should allow the custom backgrounds to work on other platforms
(:eyes: on you Windows).
Merge pull request #12 from jugglingnutcase/win32-url-path-fix

Fix background image path issues on Windows
Add current directory to modules path

Since symlinking the shell's app directory to the source isn't working
for me.
Add some stuff from the default config

i'm not sure why yet, but this got things launching better for me.
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 remote-tracking branch 'origin/master'

Conflicts:
	app/src/controllers/home.coffee