Implement a first approach of orderBy filter benchmarks by using benchpress

Hi @jeffbcross , please take a look this pull request and I'm curious to understand if the way I implementing 
the benchmarks for `orderBy` is correct.

In this commit I try to see the different benchmark between different expression param.
https://docs.angularjs.org/api/ng/filter/orderBy 

About the tool [benchpress](https://github.com/angular/benchpress), I don't really understand the part
`Select number of samples to collect and average:` what really does, because if I change the number does not
looks something happen.

The tool is not hard to set, and for my personal experience the hardest part was figure out what is the best way to test my directive and capture the best realistic benchmark.

In the end I really like that this tool could be an official way cross of all AngularJS directives/filters to test the performance release by release.