Add tutorial 4

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+import tweepy
+
+""" Tutorial 4 -- Errors
+
+Errors are going to happen sooner or later in your applications.
+This tutorial will show you how to properly catch these errors in 
+Tweepy and handle them gracefully in your application.
+"""
+
+""" TweepError
+
+Tweepy uses a single exception: tweepy.TweepError.
+When ever something goes wrong this exception will be raised.
+Here is an example:
+"""
+try:
+  tweepy.api.update_status('this will fail since we are not authenticated!')
+except tweepy.TweepError, e:
+  print 'Failed to update! %s' % e
+
+"""
+TweepError's can be casted to string format which will
+give details as to what wents wrong.
+The main reasons an exception will be raised include:
+
+  -HTTP request to twitter failed
+  -Model failed validation
+  -Trying to use an authenticated API endpoint w/o authenticating
+  -Invalid parameters supplied to API methods
+  -Authentication failures
+
+Be sure to keep a look out for these exceptions and handle them properly.
+"""
+
+""" The End """
+