changed postToWall() to postWall() in FacebookAuth.java.

created method postToWall(). this method should post without user interaction

in FacebookAuth.java i splite the init() method into two. authorize() and logout(). 

created postToWallDialog() in FacebookAuth.java to display a dialog when posting to wall. 

created a custom exception called SessionNotValidException to be thrown when facebook hates us

t seems the facebook sdk is not saving an access token when trying to make a direct facebook graph request. 
it does save the access token when calling a dialog but prompts for credentials. i believe the authorization process is failing. not sure why. still researching.

TravelPost/src/com/TwentyCodes/android/Facebook/SessionNotValidException.java

@@ -0,0 +1,16 @@
+package com.TwentyCodes.android.Facebook;
+
+import android.accounts.AccountsException;
+
+public class SessionNotValidException extends AccountsException {
+
+	/**
+	 * generated id
+	 */
+	private static final long serialVersionUID = 624797017013181185L;
+	
+	public SessionNotValidException(String message) {
+		new AccountsException(message);
+	}
+
+}