fixes some issues in README, auth pages, dependencies, duplicated angular includes, and broken uglify

1. fixed jshint warnings and removed an obsolete symlink
2. updated README
3. fixed bad links on register and sign-in page
4. consistently use the phrase "sign in", "sign out", and "register" for user experience (as recommended here: http://ux.stackexchange.com/a/1084)
5. cleaned up package.json