improve variable names
improve documentation
don't redefine sum() use numpy.matlib.sum() explicitly
split 3D plotting into functions

* plot3d_label_axes()
* plot3d_set_minmax()
* plot3d_filaments()
* plot3d_tess_edges()
* plot3d_tess_tri()
* plot3d_junction()
preset values from the commandline for GUI testing
use CellJunction object instead of calling filament_parser.py
more junctions sample datasets
rename filament_parser.py to junction_statistics.py
poor man's multithreaded generation of 3D animations
cleanup imports and ws