Ignore Python compiled files
Fix bug due to typo
Refactoring to improve focus and encapsulation.
Now "photodb.py" doesn't have any dependency on modules neither "media" nor "walk".
Photodb.py doesn't care for files (except that containing the DB itself).
Add support for Sony raw pictures format: ARW.
Add exception catching for "wrong permissions" error when moving media files.
Fix little bug in DB rebuild method calls.
Documenting main methods
Add documentation
Update version