Merge pull request #1 from sebnapi/master

refactoring, fixed Vote and VoteManager, overriden save method on Vote, ...
Merge pull request #2 from sebnapi/master

added tests to README
imports fix
added angular.js along with basic api service and add tip controller
added possibility to add tip; paginated tips view
removed unnecessary files from repository
fixed Tip Admin view
added vote up/down on model and tests
Merge branch 'master' of github.com:sebnapi/1337