FIX: use new remote webappsActor to install app with permissions on b2g instance
FIX: fix installing hosted and hosted generated apps using remote webappsActor
FIX: workaround appId generation regression (due to b2g-desktop forced exit) and code cleanup
change gDirService to Services.dirsvc
don't kill b2g instance to install and update apps
Merge pull request #263 from rpl/fix-b2g-install-app-permissions

FIX: install/update app with permissions on b2g instance