Abstract Login class

implement login and logout method
Abstract Login class

implement login and logout method
Merge branch 'beta' of github.com:pushparaj-obl/SocialPluginsiOS into beta

Conflicts:
	OBLLogin.h
Delete OBLLogin.h
Delete OBLLogin.m
Facebook Test Code

Facebook test code with library.
Library files is in folder FacebookCode/FacebookLibrary
Facebook Test Code

Facebook test code with library.
Library files is in folder FacebookCode/FacebookLibrary
Merge branch 'beta' of github.com:pushparaj-obl/SocialPluginsiOS into beta
Facebook login library

Folder Library has library files.
Folder SampleFacebookCode has a sample code to check library file.