Add Zulu 7

Azul's supported line of OpenJDK 7 builds.

Casks/zulu7.rb

@@ -0,0 +1,42 @@
+cask 'zulu7' do
+  version '7.0_95,7.13.0.1'
+  sha256 '3744b75e621876934c3dc256491d5a3e58b73cd96e2b809c77a333f7e34debbe'
+
+  url "http://cdn.azul.com/zulu/bin/zulu#{version.after_comma}-jdk#{version.before_comma.underscores_to_dots}-macosx_x64.dmg",
+      referer: 'http://www.azul.com/downloads/zulu/zulu-mac/'
+  name 'Azul Zulu Java Standard Edition Development Kit'
+  homepage 'http://www.azul.com/downloads/zulu/zulu-mac/'
+  license :gratis
+
+  pkg "Double-Click to Install Zulu #{version.major}.pkg"
+
+  postflight do
+    system '/usr/bin/sudo', '-E', '--',
+           '/bin/mv', '-f', '--', "/Library/Java/JavaVirtualMachines/zulu-#{version.major}.jdk", "/Library/Java/JavaVirtualMachines/zulu-#{version.before_comma}.jdk"
+    system '/usr/bin/sudo', '-E', '--',
+           '/bin/ln', '-nsf', '--', "/Library/Java/JavaVirtualMachines/zulu-#{version.before_comma}.jdk", "/Library/Java/JavaVirtualMachines/zulu-#{version.major}.jdk"
+    if MacOS.release <= :mavericks
+      system '/usr/bin/sudo', '-E', '--',
+             '/bin/rm', '-rf', '--', '/System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK'
+      system '/usr/bin/sudo', '-E', '--',
+             '/bin/ln', '-nsf', '--', "/Library/Java/JavaVirtualMachines/zulu-#{version.before_comma}.jdk/Contents", '/System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK'
+    end
+  end
+
+  uninstall pkgutil: "com.azulsystems.zulu.#{version.major}",
+            delete:  [
+                       "/Library/Java/JavaVirtualMachines/zulu-#{version.before_comma}.jdk",
+                       "/Library/Java/JavaVirtualMachines/zulu-#{version.major}.jdk",
+                       MacOS.release <= :mavericks ? '/System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK' : '',
+                     ].keep_if { |v| !v.empty? }
+
+  caveats <<-EOS.undent
+    If this cask is upgraded, previous stale versions will be left under
+    'Caskroom/zulu7/{version}'. Stale versions may also be left under
+    '/Library/Java/JavaVirtualMachines/zulu-{version}.jdk'. Removing them may
+    require manual deletion, e.g.
+
+      rm -rf /opt/homebrew-cask/Caskroom/zulu7/
+      rm -rf /Library/Java/JavaVirtualMachines/zulu-7*.jdk
+  EOS
+end