message: Update URL to Timing and Profiling in IPython
  Apparently the blog has been updated and the URL has changed, it is still there though.
diff: @@ -163,7 +163,7 @@ Additional Resources
  -# [Python Optimization Techniques](http://wiki.python.org/moin/PythonSpeed/PerformanceTips)
  2. Scipy Lecture Notes - [Advanced
  Numpy](http://scipy-lectures.github.io/advanced/advanced_numpy/index.html#advanced-numpy)
  -3. [Timing and Profiling in IPython](http://pynash.org/2013/03/06/timing-and-profiling.html)
  +3. [Timing and Profiling in IPython](http://pynash.org/2013/03/06/timing-and-profiling/)
  Exercises
  ---------
  