Add RT film alias

Set an alias of namespace rt:filmid to the RT film ID.
Also fix a bug that meant multiple versions were being
created.
Merge pull request #482 from atlasapi/radiotimes-set-alias

Add RT film alias
Link clips based on clipOf since the URI no longer
contains the episode URI
Update C4 clip embed code
Merge pull request #483 from atlasapi/inline-clip-extraction

Inline clip extraction
Iterate over known channel aliases for redux latest
ingest
Merge pull request #484 from atlasapi/redux-latest-for-channels

Iterate over known channel aliases for redux latest ingest
Purge content

Add controller to allow purging of content for
lyrebird youtube publisher.
Merge branch 'purge-content' into stage

Conflicts:
	src/main/java/org/atlasapi/remotesite/channel4/pmlsd/C4ContentLinker.java
	src/main/java/org/atlasapi/remotesite/redux/HttpBackedReduxClient.java