added new cop reduce_arguments
Merge pull request #76 from bolandrm/reduce_arguments

New Cop: Ensure that reduce arguments are |a, e|
Fix a typo in the README
New rule: Use %r only for regular expressions matching more than one '/' character.
Merge pull request #78 from jonas054/more_rules

New rule: Use %r only for regexpes matching more than one '/'.
Improve OpMethod cop

Operators [], []= and << are now excluded from the check.
Remove a bit of debug code
Fix #75 - enhance AvoidPerlisms's messages