Merge pull request #34 from cschroed-usgs/PUBSTWO-995

Pubstwo 995
Changed the auth call to use standard form posting of params.
Merge pull request #37 from thongsav-usgs/master

Changed the auth call to use standard form posting of params.
updated spec to look for post body params
Merge pull request #38 from thongsav-usgs/master

updated spec to look for post body params
Fixing http response interceptor according to: https://github.com/angular/angular.js/issues/2609#issuecomment-44452795
Tweaking error-handling. Validation errors now caught and <generally> reported.