When creating a conference, make sure that the entity returned has an initialized, but empty, array of pages (instead of null).
 - Of course, if the conference object passed in has populated pages, those would be returned.
When creating a page, the page entity should be returned with at least an empty array of blocks
 - Same as previous commit, except for pages/blocks instead of conference/pages
Merge pull request #20 from CruGlobal/create-conference-return

Create conference return