add scale ratio to hs_layout_editor to return the correct x, y, w, h.
Merge pull request #13 from huchengtw-moz/luke-tv-arch1-widget-scale

add scale ratio to hs_layout_editor to return the correct x, y, w, h.
* appList can handle app install/update event now
* add appList paging indicator
[System] Receives widget IAC requests. Add update and remove widget operation.
handle app update and uninstall
Merge pull request #15 from huchengtw-moz/luke-tv-arch1-widget-app-update

handle app update and uninstall
* appList can handle app uninstall event now
* add test_only.js (use F1 ~ F3 to test app's install/update/uninstall events)
Merge pull request #14 from rexboy7/tv-widget-system-modifyremove

[System] Receives widget IAC requests. Add update and remove widget operation.
* fix some appList bugs