Add profiling and performance application

A live version of this is can be previewed at http://rawgithub.com/peitschie/WebODF/perf-master/programs/benchmarking/src-index.html. Note: Accessing via github takes a while to load all the necessary scripts!

I've exposed some selection manipulation functions in order to benchmark these. They really should be divided out into a separate class, but I did not want to undertake this right at this moment.

![screen shot 2013-11-08 at 6 30 19 pm](https://f.cloud.github.com/assets/1052079/1498898/c93fe876-4847-11e3-9474-db1b351c11d4.png)

![screen shot 2013-11-08 at 6 31 08 pm](https://f.cloud.github.com/assets/1052079/1498899/da09c758-4847-11e3-95a6-a987e0349465.png)