[MlMt] Use a different gpg2 program

[Giovanni Lanzani]

Hi there,

I kind of managed to have Mailmate recognise gpg2 installed via homebrew 
(via `ln -s`). Through gpg-agent and pinentry I was able to have OSX 
remember my pub/private key passphrase. But there's still a (hopefully 
last) problem: Mailmate still can't sign email giving me the

	Signing or encryption failed for unknown reasons

error. Any thoughts? I expect this to be hard to track down due to the 
uncommon setup, so feel free to just ignore me :)

Giovanni
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