Updated README.md
Move gpxclean.py to gpxutils/gpxclean/__init__.py
Move gpxclean/__init__.py functionality into function
Rename __init__.py to __main__.py
Add output directory option
Add gpxpull/__main__.py
Move gpxclean module from folder to file
Move gpxpull module from folder to file
Proper import path
Add gpxutils/__init__.py to set function names
Add setup.py and tweak submodules