IntelliJ IDEA 13: Remove postfilght hack

Casks/intellij-idea13.rb

@@ -8,23 +8,19 @@ cask :v1 => 'intellij-idea13' do
 
   app 'IntelliJ IDEA 13.app'
 
-  postflight do
-    plist_set(':JVMOptions:JVMVersion', '1.6+')
-  end
-
   zap :delete => [
                   '~/Library/Application Support/IntelliJIdea13',
                   '~/Library/Preferences/IntelliJIdea13',
                  ]
 
-  caveats <<-EOS.undent
-    #{token} may require Java 7 (an older version), available from the
-    caskroom-versions repository via
-
-      brew cask install caskroom/versions/java7
+caveats <<-EOS.undent
+  #{token} requires Java 6 like any other IntelliJ-based IDE.
+  You can install it with
 
-    Alternatively, #{token} can be modified to use Java 8 as described in
+    brew cask install caskroom/homebrew-versions/java6
 
-      https://github.com/caskroom/homebrew-cask/issues/4500#issuecomment-43955932
-  EOS
+  The vendor (JetBrains) doesn't support newer versions of Java (yet)
+  due to several critical issues, see details at
+  https://intellij-support.jetbrains.com/entries/27854363
+EOS
 end