Merge pull request #43 from parananon/master

Added Thunderbird 15.0.1 and Transmit 4.2

Casks/thunderbird.rb

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+class Thunderbird < Cask
+  url 'http://download.mozilla.org/?product=thunderbird-15.0.1&os=osx&lang=en-US'
+  homepage 'http://www.mozilla.org/en-US/thunderbird/'
+  version '15.0.1'
+end

Casks/transmit.rb

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+class Transmit < Cask
+  url 'http://www.panic.com/transmit/d/Transmit%204.2.zip'
+  homepage 'http://panic.com/transmit/'
+  version '4.2'
+end