Add universal build option to tidyp
Added formula for CSSTidy.

Uses the trunk checkout due to unsuccessful extraction of the proper
source zip file.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

* Use 'head'
* Use http instead of https
* Build in parallel
Mark scons, cmake & pkg-config as build-time deps
Use ruby style for inheritance.
Use ENV.make_jobs in formulae

Some formulae are still calling Hardware.processor_count; replace those
instances with ENV.make_jobs.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>