New rule: use spaces inside hash literal braces, or don't.

Which style to use is configurable. Default is with spaces.
Merge pull request #114 from jonas054/hash_literal_spaces

New rule: use spaces inside hash literal braces, or don't.
Add new cop LineContinuation
Minor changelog improvements
Add new cop SymbolArray

It's disabled by default since many people (like us) might still be
targeting both Ruby 1.9 and 2.0.
Fix WordArray's handling of arrays with '' elements
merge with upstream
merge with upstream
refactoring