Oauth code simplification

Work Done in this Task : 
1) removed OAProvider and all dependency on that from OAuth1 files. 
2) removed OADance and all dependency on that from OAuth1 files. 
3) Made code consistent with OAuth2.
4) Took care of the synchronization issue in OAuth1.
5) Tested with Smartcloud, Twitter, Dropbox. 
6) Tested by running a sample trying to connect to SC and Twitter, using OAuth1, at the same time. Works perfect. 
7) Modified Twitter and Dropbox samples for accomodating the "Response" returned from ClientService.
@bhavesh, @Phil - Kindly review and let me know the comments.