Add settings to a content type to allow it to be used as a channel

Here's a patch with the following:

58ea8d1 #1147062: Add the initial ooyala_channels.info file.
823af65 #1147066: Add the initial node type settings form for Ooyala channels.
744c3f0 #1147066: Only allow configuring of Ooyala channels if Ooyala has been set up.
abb8203 #1147066: Clean up content type variables when deleting a content type or uninstalling Ooyala Chapters.

Minor update to change a "return" to a "break" in the switch statement.