some unfinished code for label creation
removed Element creation from EditorManager, some styleguide fixes
Added ability for labels to save and load themselves to/from repo.
build fixed
save/load fixed.
fixed crash when creating elements
fixed label coordinates
fixed label positions
fixed label position loading
styleguide
styleguide fixes
Merge pull request #970 from qreal/labelsFix3-scene

Labels fix stage 3 --- scene