Direcotry install feature added to wrt-installer

Direcotry install feature added to wrt-installer

[Issue#] LINUXNGWAP-572
[Problem] SDK takes too long time to install/update widget
[Cause] Steps done: zipping->transfer->uninstall->install->unzipping->checking version
[Solution] Added feature to install widget directly from directory.
To do that run wrt-installer -i /path/widget_directory (note that -if works as before)
Widget is not zipped/unzipped and version check is not performed (always update)
[Verification] First of all check if old options works correctly, wrt-test-w3c
might be helpful.
Secondly check if new feature works by installing/updating/running/uninstalling
widget with -i /directory option

Change-Id: I4a07c66e74630df7c97b015c9dadbe3452da7509