Merge branch 'devel/tizen_3.0' into tizen

* devel/tizen_3.0:
  Added a space between literal and string based on C++11
  Add testcases for trigger time event/condition
  Replace ctx::json with ctx:Json
  Add DBusClient & IDBusClientListener
  Replace build dependency context-common with libcontext-shared
  Added API for custom items - add_custom_item(), remove_custom_item(), publish_custom_data() - context_trigger_enable_rule() will return NOT_SUPPORTED

Change-Id: I24223ce8bbe8fa590b9ab19fe6bd49f017cb6ac1
Signed-off-by: Somin Kim <somin926.kim@samsung.com>