sublime-text-dev: Various improvements

Add appcast, uninstall, zap, and conflicts_with stanzas. Add comment for
url indicating that download host is official vendor.

Casks/sublime-text-dev.rb

@@ -2,13 +2,28 @@ cask :v1 => 'sublime-text-dev' do
   version '3069'
   sha256 '96f0ed890839bc554e8fd26b03c9404218feacb4aefbedc0fac9cdd87799654d'
 
+  # rackcdn.com is the official download host per the vendor homepage
   url "http://c758482.r82.cf2.rackcdn.com/Sublime%20Text%20Build%20#{version}.dmg"
+  appcast 'http://www.sublimetext.com/updates/3/dev/appcast_osx.xml',
+          :sha256 => '13d474c1ab90f6b9d78277d05b4593dffd6b4b822742004aebf80dc15ecccbe5'
   name 'Sublime Text'
   homepage 'http://www.sublimetext.com/3dev'
   license :closed
 
   app 'Sublime Text.app'
   binary 'Sublime Text.app/Contents/SharedSupport/bin/subl'
+
+  uninstall :quit => 'com.sublimetext.3'
+
+  zap :delete => [
+                  '~/Library/Application Support/Sublime Text 3',
+                  '~/Library/Caches/com.sublimetext.3',
+                  '~/Library/Preferences/com.sublimetext.3.plist',
+                  '~/Library/Saved Application State/com.sublimetext.3.savedState'
+                 ]
+
+  conflicts_with :cask => 'caskroom/versions/sublime-text3'
+
   caveats do
     files_in_usr_local
   end