created webauth.xml to be used with displaying the web auth site, and allowing the user to input their auth code

i created WebAuth.java to be used to display the social client auth site, and get the users auth code

started intergration of twitter

TravelPost/res/xml/settings.xml

@@ -1,6 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" android:title="Travel Post">
         <PreferenceCategory android:title="Services">
+        
+        	<Preference
+        		android:title="Twitter Sign In"
+        		android:key="twitter_sign_in"/>