Move homebrew install scripts to its own repo so you can tap the scripts...

... within homebrew. Modify osx install doc.

Now you can install with:
$ brew tap mahyar/ot
$ brew install open-transactions

Tested by deleting all dependencies on my computer (openssl, etc) and reinstalling with those two commands.  Then I ran otsever & opentxs.  I've only tested with 10.9 so no guarantees with 10.8