Update README.md
Merge pull request #25 from nemesis/master

Bump podspec version to 2.1.0
Added a few classes/categories to aid API login actions
Added a new category for fetching GET query params, renamed the old callback category
A bit of reordering and cleanup over the SERequestHandler class
Added Login actions via API to SEAPIRequestManager, also a bit of cleanup
Added a private header for the SEAPIRequestManager to make using OAuth callbacks category possible and simple
Updated the login fetching delegate
Implemented the NSURL query arguments category, also added spec
Fix typo in SEModelsSerializingAdditions description
Implemented the OAuth callback additions category on SEAPIRequestManager
Fix property declaration indentation in SEError header
Add interactiveHtml field to SELogin for interactive logins
Added utility method  to SEProvider, also spec
Renamed the SBWebView classes and categories into corresponding SE counterparts
Cleaned up the constants file, also moved SEAPIRequestManager private constants to public usage
Fix SECallbackAdditions spec due to renaming
Update the demo app to handle API login creation, brought back some classes & helpers from V1 demo app
Append a local host to the return_to URL in OAuth tokens docs
Merge pull request #28 from nemesis/api-login-creation

API Logins creation