Fleshed out the CAPI stuff

Project is now waiting for some more facia work, specifically,
integrating/(pasting from) the existing facia client.
Merge pull request #2 from guardian/capi-additions

Fleshed out the CAPI stuff
Merge branch 'master' into add-facia-client-dep

Conflicts:
	build.sbt
	src/main/scala/com/gu/facia/api/FAPI.scala
	src/main/scala/com/gu/facia/api/facia/Facia.scala
	src/main/scala/com/gu/facia/api/model.scala