Android Graph API addition, Update iOS SDK, Android SDKs and update to README.md

### Testing code

```
document.addEventListener('deviceready', function () {
	            
    var fbLoginSuccess = function (userData) {
	    alert("UserInfo: " + JSON.stringify(userData));
	    
	    facebookConnectPlugin.api(userData.authResponse.userId, [], 
	    function (result) {
	        alert("Result: " + JSON.stringify(result));
	    }, 
	    function (error) { 
	        alert("Failed: " + error); 
	    });
	}
	
	facebookConnectPlugin.login(["basic_info"], 
	    fbLoginSuccess, 
	    function (error) { alert("" + error) }
	);
}, false);
```