Fix chunk count

When a file only has two chunks, the count was wrong and the header was
missing
Added function update_share()
README: Info about update_share()
PEP8 - comparisons to None @ update_share()
Small fix @ update_share() to make it work with >= OC6
Merge pull request #46 from PVince81/fix-chunk-count

Fix chunk count
Added unit tests: update_share()
Merge pull request #31 from soalhn/update_share

Added function update_share()
Added webdav move
Print custom headers when debug mode is enabled
Swapped move parameters
Merge pull request #43 from PVince81/move

Added webdav move
Unicode support WIP
Add data provider module for unit tests