Rotate Perf - decrement improves speed slightly
Rotate Perf Test - ===

Remove hasOwnProperty call in favor of === undefined; 20%+ performance
improvement.

http://jsperf.com/rc-rotate-tests/2
v0.04r3 - removed extra typeof check

All variables respond to for-in loops, even null & undefined so no need
to type check.
v0.05 - array.rotate perf updates
Rotate Tests 5

Fixed array length. Mixed results:
http://jsperf.com/rc-rotate-tests/5
perfTests Directory
Merge branch 'master' into rotatePerf
Merge branch 'rotatePerf'