HTTP/XML Print Server for Adafruit Thermal Printer

This is a Python/Flask-based HTTP server that uses the Adafruit Thermal
Printer library to communicate with a thermal receipt printer. The
server accepts formatted XML by HTTP POST, and parses it to extract
commands for the printer. This makes it possible to "push" content to
the printer (e.g., running on a Raspberry Pi), which opens up a number
of cloud-based automation options.
Test client for XML print server

Tests a few of the print options, similar to the basic Adafruit test
program. Some things still don't work quite right.
Quick fix for possibly empty <lineheight /> tag
Edits from old Raspberry Pi system.
Edits for lbfgs.eos.ubc.ca.
Merge commit '590ac5a1503846e427c4365c8f30596f7b6f06c8' into localmac

Conflicts:
	server.py
Merge...
Merge commit '27e2808a58774f682479bb5af338200217beafd2' into localmac

Conflicts:
	server.py
Changed default target.
Fixed test package.