boost.py:
improved regex, removing unnecessary plus sign (we want to match only one group)
reworked python matching (mostly for ubuntu I guess). In case of boost_python, tags and python version are optional, which should work on ubuntu and other cases, without duplicating matching patterns if we aren't searching for boost_python.
added back mandatory tags for the last line (for windows) and added a last line to match boost_lib only (arch/manjaro)
removed testing code.
boost.py: use a different variable to not overwrite tags when matching libs (with python)
Updated the pdflatex example for newer texlive versions (Ubuntu 14)