Slides created dynamically by slides source
Funcs for getting pending, current, previous or next slide
Decreased number of args in couple of funcs
Images loaded asynchronously
refs #614
remove photo buffer loading for all pics - needed only for edition
refs #623
delete hard_coded photo_path jagoda.jpg from photo_edition.json - fix
Photos loaded no asynchronously
refs #614
Merge branch 'master' into slides-loading

Conflicts:
	pisak/viewer/widgets.py
Replaced not used data loader with lib manager
Applied docs and resigned from lambda handler due to code review
Applied lib manager to the slides source in viewer widgets
refs #614
Added docs to viewer widgets methods
Applied previously omitted pep8
refs #614
Merge branch 'master' into slides-loading