openalpr 1.2 (new formula)

Hopefully this formula will get a little simpler once/if my upstream pull
request is accepted:

https://github.com/openalpr/openalpr/pull/55

A notable one-off in this formula is that I couldn't include a "depend_on" for tesseract, as the formula depends on the "--devel" version of tesseract.  See the "caveats" method for more info.
I needed to in order to work around not being able to rely on "depends_on".  However, if this can't be merged until Tesseract 3.03 is released, then this logic is moot.