Merge branch 'devel/tizen_3.0' into tizen

* devel/tizen_3.0:
  Replace timer_manager & timer_util with TimerManager
  Replace ctx::json with ctx:Json
  Remove direct build dependency to context-common
  Modified trigger to use package id for rule management - request get_app_id() removed
  Modified template manager as singleton - rule_manager calls apply_templates() to synchronize template db
  Modified to support custom item
  Apply Tizen C++ coding style to the constructor of DBusServer
  Replace scope_mutex with ScopeMutex
  Remove dependency to libxml from CMakeLists

Change-Id: Ie25522bdbb3bbca9ba7405b2887180f684ffc2fd
Signed-off-by: Somin Kim <somin926.kim@samsung.com>