Enhance ReactClass to support more Perf functions

[gfogle]

Currently, ReactClass just loops through lifecycle methods when being created and attaches to prototype of Constructor function or sets to null.

I think the ReactPerf and ReactDefaultPerf would benefit from having ReactClass do an if (__DEV__) check during this phase and re-route lifecycle methods through ReactPerf.measure.

This would allow more advanced metrics down the line about lifecycle methods being executed. I think I have a PR ready if this is something that should be in core; which I think it is.

[gfogle]

moved this over to #5254 to better articulate what I'd like to add in