Selective sync:  Add UI to select paths
Move the update job in a new file named discoveryphase

"Discovery" is a better name than "update"
Selective sync:  ignore the files that are not in the selective sync white list
Selective sync:  remember the old list when accepting the dialog even if the tree was not expanded
selective sync:  fix whitelist matching
Merge remote-tracking branch 'origin/master' into selective_sync
Selective sync:  use a black list instead of a white list
Selective Sync:  refactor the widget in its own class
Selective sync: add a page in the folder wizard
Selective sync: hide the header
Merge branch 'master' into selective_sync

Conflicts:
	src/mirall/syncengine.cpp
	src/mirall/syncengine.h
DiscoveryPhase:  put in namespace Mirall