Fixed oclint-nightly cask

- oclint-nightly fails on brew cask audit due to URL
- the URL has single quotes originally, changed to double quotes
- Double quotes needed if using #{version}

Casks/oclint-nightly.rb

@@ -2,14 +2,14 @@ cask :v1 => 'oclint-nightly' do
   version '0.9.dev.02251e4'
   sha256 'b37aa6e04fe7545d7daf7a93c0afd49998946ee918ea5bb1782dd17e0deb4c2f'
 
-  url 'http://archives.oclint.org/nightly/oclint-#{version}-x86_64-darwin-14.0.0.tar.gz'
+  url "http://archives.oclint.org/nightly/oclint-#{version}-x86_64-darwin-14.0.0.tar.gz"
   homepage 'http://oclint.org'
   license :unknown
 
-  binary 'oclint-#{version}/bin/oclint'
-  binary 'oclint-#{version}/bin/oclint-json-compilation-database'
-  binary 'oclint-#{version}/bin/oclint-xcodebuild'
-  binary 'oclint-#{version}/lib/oclint', :target => '/usr/local/lib/oclint'
+  binary "oclint-#{version}/bin/oclint"
+  binary "oclint-#{version}/bin/oclint-json-compilation-database"
+  binary "oclint-#{version}/bin/oclint-xcodebuild"
+  binary "oclint-#{version}/lib/oclint", :target => '/usr/local/lib/oclint'
   caveats do
     files_in_usr_local
   end