First round of trying to improve the performance of attr_reader and attr_writer. From ~24sec to ~15sec
Wrote tests around attr, attr_reader, attr_writer, attr_accessor
Merge branch 'master' into attr-perf-fix

Conflicts:
	mrblib/class.rb
Slight cleanup of code
Changed the attr methods in mrblib, so that they take advantage of validating the name against a string parameter if need be
Merge branch 'master' into attr-perf-fix
Reset the so-render benchmark so that it is what it was before my attr performance testing.
Cleaned up some of the Module#attr tests
Merge pull request #1396 from Archytaus/attr-perf-fix

Performance improvement of methods generated by Module#attr