Updated Rune changes to match Summoner-v1.4
Updated Rune changes to match Summoner-v1.4

From Riot announcement,
>This API does not include any static data for the runes in the
>/api/lol/{region}/v1.4/summoner/{summonerIds}/runes endpoint.
>Specifically, name, description, and tier are no longer returned.

What this means is that the `Rune` struct was dropped as it stored
most of this data and `RuneSlot` struct now simply references the
`RuneId` and `RuneSlotId`.

TrevorSStone/goriot,collinglass/goriot,mattcan/goriot