Implemented the hilite tool interface
Implementation of the scannable interface by the photo tile
refs #630
Adapted aperture to implement the hilite tool interface
Album and library tiles use aperture as their hilite tool
refs #630
Pep8ed and removed not neccessary tuple in aperture
Cleared photo slide class
refs #630
Add aperture as a child in hilite tool property setter
Fixed indent, missing import, dot after after module, notify cover signal connection
refs #630
Enabled tile aperture hilite
refs #630
Merge branch 'master' into tile-scannable
Merge branch 'tile-scannable'