Merge branch 'master' into viewer-launching
move launcher to pisak folder for further use in other apps, not only viwer
refs #552
fix docs and make file consistent with pep8
refs #552
app.py consistent with pep8
refs #552
code review fixes, duplicated variable, undefined variable, add fix_path
refs #552
small xdg module for east access to folders according to xdg
refs #618
Photos and albums as many to many relationship
Added few sqlalchemy type of functions
refs #620
Merge branch 'master' into sql-al

Conflicts:
	pisak/launcher.py
	pisak/viewer/app.py