Release version 0.7.8

Release version 0.7.8

Changes:
 - Add BackendInvoker unittest
 - Minor refactor pkg_upgrade tool
 - Change unittest directory hierachy
 - Move unit test main code
 - Fix pkg_upgrader
 - Add skeleton codes for rsc-copy tool
 - Add missing include
 - Implement ParamChecker class
 - Add GetRequestHandlerType() on AbstractRequesthandler
 - Change prototype of some functions
 - Implement RequestHandlerInvoker, ConditionValidator
 - Implement RscHandler
 - Merge "Fix pkg_upgrader" into tizen
 - Parse session-id for emitting signal in rsc-copy

Change-Id: I5ee0d42d42ec80fcf0a3dd534e9fa53e2d5c6dca
Signed-off-by: Junghyun Yeon <jungh.yeon@samsung.com>