Improve Alias's message
Fix build under OS X

Prior to this change this example was blowing up like this:

No such file or directory @ rb_sysopen -
/private/var/folders/32/92h89tr96rs0s79j4ckhhm_r0000gn/T/d20140401-28276-qdod47/work/spec/rubocop/cli_spec.rb:390
Typo in README: 'in generally' → 'is generally'
Merge pull request #939 from Dorian/patch-1

Typo in README: 'in generally' → 'is generally'
Improve AccessorMethodName's message
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Improve CaseEquality's message a bit
Improve spec a bit
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Correct DefWithParentheses' file name
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