Added dropbox-offload script.
Ignore added PyCharm project directory.
Multiple simultaneous changes will not run the update function multiple times.
Better logging and fixed bugs with removing directories.
Added printing of statistics.
Fixed infinite recursion when comparing Statistics objects.
Also remove top-level directories in the offload directory.
Refactoring.
Files that collide with already offloaded files are now immediately offloaded.
Fixed bug which would remove the complete offload directory.
Renamed script to __main__.py.