Added dropbox library and authentication

- flickr images multiple upload sample code ready
- dropbox authentication done
Merge branch 'Harsh' of github.com:shahmharsh/SharePic into Harsh
some changes
Merge branch 'master' into Harsh

Conflicts:
	.DS_Store
	SharePic.xcodeproj/project.pbxproj
	SharePic.xcodeproj/project.xcworkspace/xcuserdata/Horsie.xcuserdatad/UserInterfaceState.xcuserstate
	SharePic/HRConstants.h
	SharePic/HRConstants.m
	SharePic/HRProfileDetailViewController.m
	SharePic/Info.plist
Changed taking images from album class now
Merge pull request #4 from shahmharsh/Harsh

Added dropbox library and authentication, merge master into harsh