Keep line length to 80

https://travis-ci.org/bbatsov/rubocop/jobs/33575169
Tab cop does auto-correction

Fix #1272
Merge pull request #1297 from yous/patch-line-length

Keep line length to 80
Allow the use of unary ops in SymbolProc
Merge pull request #1296 from yous/patch-tab-auto-correct

Tab cop does auto-correction