added `hoodie.checkConnection()` method #31
made `hoodie.checkConnection()` continuesly check for existing connection. `hoodie.checkConnection()` can also be called from outside to trigger a check en demand. It won't send more than 1 request but return a pending promise if there is one. #31
made `hoodie.remote` do `hoodie.checkConnection` when pull & push fails. Also made `hoodie.remote` subscribe to `online` event. Fixes #31
renamed `online` & `offline` events to `reconnected` and `disconnected`, cause that's what they are, really #31
build