add repo and homepage to package.json
move angular.js outside build block

so that it can be cdnified. requires manually applying patch from
passy/google-cdn@72e44f01 until btford/grunt-google-cdn#38 is
fixed
htmlmin
comment out unnecessary uglify task
replace ng-translate-loader-static-files with build step

- New custom grunt task "jsFromJSON" to combine all JSON from locale dir into
  a script translations.js that popuplates window.translations with the JSON.
  This allows us to ditch angular-translate-loader-static-files along with its
  pesky flash of untranslated content.
- Fix htmlmin.