Fixes 303.
Solr field containing thumbnail url changed names from 'thumbnail_tesim' to 'thumbnail_ssm'.
Merge pull request #304 from afred/fix-303

Fixes 303.
Merge pull request #305 from afred/custom_collections_301_RB

Custom collections 301
Closes #307.
Merge pull request #308 from afred/hide-catalog-scroller

Closes #307.
Fixes up the series#show page
#284 - created model for carousel items to display on the homepage
Forward progress on videos#show
Merge pull request #310 from afred/manage-carousel-items

#284 - created model for carousel items to display on the homepage
Merge pull request #311 from afred/show_pages

Show pages
Fixes admin dashboard bug.
Changes custom collection item to reference 'id' instead of 'slug'.
Adds condition to error message for ingest.
Changes 'exhibit' nomenclature to 'carousel' for home page, and adds UI for carousel, using CarouselItem records from db, and jquery 'slides' plugin.
Refactors some dipslay logic for home page carousel and user profile pages.
Tweaks display logic just a bit for user profile page.
Fixes display of tabbed content.
Switches to using byebug for debugging.
Fixes some tests around User model
Fixes factory for User instances.
Fixes routes for /scholar/user-name.
Removes Mozilla PDF viewer, replaces with iframe in custom_collections#show.
Moves display of 'Credits' field into 'Collaborators' tab in custom_collections#show.
Changes label of 'credits' field to 'Advisors'.