Serve built assets from build/ dir
Move rework and rework-pure-grids to "dependencies" form devDependencies
Add `grunt` to npm post-install script to build the things
Merge branch 'mobile-first' of github.com:tilomitra/pure-site into mobile-first

Conflicts:
	package.json
Merge pull request #16 from ericf/mobile-first

Added build/ dir and setup things to aid deployment