Update dependencies and add new ones from webapp generator
In gruntfile, switch from matchdep to load-grunt-tasks, add time-grunt
Change .bowerrc to make bower directory bower_components
Change RequireJS config files to use new bower_components location
Change karma config to use new bower_components location
Remove usemin.html file for upcoming usemin changes
Remove google-centric stuff in 404 template
Support automatic cache-busting of all assets in production. Include a couple new grunt tasks into Gruntfile from generator-webapp
Update version to 0.4.0