Assign overriden superclass methods to this._super instead of passing, update examples. This is related to #2 as it is a reversal of 71d400bc3c5793fcc237a6f76f0bededee280a54's changes

Break up benchmarks into suites

Update build dependencies, use grunt-benchmark 0.2.0, install grunt-cli using Travis script instead of including as a dependency, don't run benchmarks on Travis
Added functionality to define properties on instances using property descriptors
Add additional tests for monkey-patching prototype
Support strings for set/get on property descriptors, delegate to the instance