Python 2.7 compatibility added by making super() more verbose
Added Linux and Python2 stuff to README
Fixed a typo in a code example in README
Implemented get_ui_path(). Normalised function names
README updated to reflect Python 2 compatibility status
Added small documentation docstrings.

Concerns pyformula.gui.get_ui_path() and pyformula.gui.load_ui().
Merge pull request #8 from Rubykuby/py2

Support for Python 2.7. README updated.