Add "vendor/static" assets. 

Anything copied here will respect the directory structure relative
to its root, which is handy when a 3rd party library has one type
of asset (CSS) referencing another type of asset (fonts, images)
Rename gitkeep to keep.

Gotta keep up with dem Railses.
extract lineman-fetch to a file b/c gross.

B/c I don't believe in refactoring, I also added support for multiple
recipes per command. So stuff like `lineman fetch ember backbone` will
work.
0.32.0