UnneededCapitalW cop now does auto-correction

When autocorrection is called for, UnneededCapitalW does a simple
replacement of %w for %W.
Merge branch 'master' of https://github.com/sfeldon/rubocop
essage is:

UnneededCapitalW cop now does auto-correction

When autocorrection is called for, UnneededCapitalW does a simple
replacement of %w for %W.

UnneededCapitalW cop now does auto-correction

When autocorrection is called for, UnneededCapitalW does a naive
search-and-replace of %w for %W.

Conflicts:
	lib/rubocop/cop/style/unneeded_capital_w.rb