Update iTerm2 beta formula to the latest version.

iTerm 2 has been updated to 2.0.0.20141022
https://iterm2.com/downloads/beta/iTerm2-2_0_0_20141022.zip

Casks/iterm2-beta.rb

@@ -1,8 +1,8 @@
 class Iterm2Beta < Cask
-  version '1.0.0.20140629'
-  sha256 'fdda227b01497c90f7c35ad9bde73ee477bb452f27acef9abbf97dc42fdf3bb5'
+  version '2.0.0.20141022'
+  sha256 'd2e16b172548bd0f08b7b1fa42f0b42f5781f4e2a6452e6ad21a24301b38577c'
 
-  url 'http://www.iterm2.com/downloads/beta/iTerm2-1_0_0_20140629.zip'
+  url 'https://iterm2.com/downloads/beta/iTerm2-2_0_0_20141022.zip'
   homepage 'http://www.iterm2.com/'
   license :oss