node-webkit: more shuffle of b9216bace8d24a3c14c8b5e37d2a0db4431510a2

Signed-off-by: Oleg Verych <olecom@gmail.com>
app_front: don't use `http.agent` for backend checks any more (todo's done)

Signed-off-by: Oleg Verych <olecom@gmail.com>
app_front: noop refactoring and coding style change

Signed-off-by: Oleg Verych <olecom@gmail.com>