Merge branch 'devel/tizen' into tizen

Merge branch 'devel/tizen' into tizen

* devel/tizen:
  Version 4.0.0
  Cleanup the publisher privileges
  Add event publisher function to the geofence agent
  Implement isIdle() function of agent plugins
  Add skeletons of the user-session agents
  Add USB state publisher
  Remove the IPC helper class
  Add custom context registration functions to support legacy context-trigger API
  Add TemporalState publisher (not observable)
  Add ContextPublisher::isObservable()
  Add WiFi state publisher
  Add user activity publishers
  Define attribute names and values for several system contexts
  Reorganize source directory: concrete state class files are moved to 'state' subdirectory
  Add CustomPublisher
  DBusAction only supports system bus
  Remove unsupported trigger URIs
  Add privilege checkers for actions
  Change the cleanup order to avoid crashes
  Implement app-control & notification actions

Change-Id: I8e0141e69b0710397f85d33247ae9fd50afc11d2
Signed-off-by: Mu-Woong Lee <muwoong.lee@samsung.com>