As of 0.31 the iOS component, the notify platform, and a new battery sensor platform are all built into Home Assistant. Going forward, the iOS app will only be compatible with 0.31 and above because of backwards incompatible changes to the iOS component. Please upgrade your Home Assistant to 0.31 and remove the custom components ASAP. I expect the first breaking build to go out tonight or tomorrow.
That is correct. The new build will be out in the next few hours. I need to write some documentation first because configuration syntax changed a bit. Sorry for the delay!