Update ui build to use 'admin' folder instead of 'core' (#792)

* Update ui build to use 'admin' folder instead of 'core'

Post release of v0.1.2, ui/core folder has been renamed to ui/admin.
Update ui build scripts to be aware of the path change.

* Update packagespec to reflect "admin" ui folder change

scripts/uigen.sh

@@ -17,7 +17,7 @@ fi
 	fi
 )
 
-uidir="${UI_CLONE_DIR}/ui/core/dist"
+uidir="${UI_CLONE_DIR}/ui/admin/dist"
 
 go-bindata -fs -o "$UI_ASSETS_FILE.tmp" -pkg ui -prefix "${uidir}" "${uidir}" "${uidir}/assets"