Added BenchmarkedFunction and BenchmarkedClass which inherit from Benchmark. Can now benchmark class functions by decorating the class with BenchmarkedClass and the bound functions with ComparisonBenchmark.
changed test_class.py example to use args for function calls
BenchmarkedClass summarizes any bound functions decorated ComparisonBenchmark.
renamed files. fixes to ComparisonBenchmark that are not bound (run_timeit was not being called).
cleaned up Benchmark.__call__(). Added BenchmarkedFunction.
added enable() and disable() functions to pyperform to turn on/off benchmarking.
updated README, changed BenchmarkedFunction in benchmark_functions.py
update README
Merge branch 'classbenchmarking'

Conflicts:
	__init__.py
	examples/__init__.py
fix README.md typo