Merge branch 'extended-scanning' into pager-scan

Conflicts:
	pisak/viewer/app.py
Added scanning to pager pages
Added features pause and kill to scanning groups
Added methods to pager for next page, show initial page, run and stop automatic
Added handlers to deal with pager
Fixed not having stage error in scanning module
Photo tile inherit after Scannable
Slideshow runnable all the time
Connect tiles to the previously declared lambda-handler
Pause scanning when in the slideshow mode, or when zoom or psycho ops
Adjusted and improved jsons for library, album, photo and photo editing view
refs #672
Fast fix of disabling disabled scanned
refs #672
Enabled switching between views
Added tiles handler to album data source
refs #672
Return all tiles from album tiles source
refs #672
Merge branch 'master' into pager-scan

Conflicts:
	pisak/viewer/app.py
Fixed moving to editing view
refs #672
Fixed editing return for good
refs #672
kick out unused button of same name from album_view
Merge branch 'pager-scan'

Conflicts:
	pisak/viewer/app.py