Created CollectionsController and spec file
WIP
Merge branch 'develop' into issue-175
Added collection info to catalog show view (if object is a Collection)
Added #components_query to Collection model
Added catalog/show_collection_info partial
Added catalog controller tests for appropriate render of partials on #show
Updated Collection#components_query to include a filter query to make sure results are limited to Component objects, plus make rows sufficiently large.
Added link on collection info tab content to download CSV report.
Added config setting DulHydra.collection_report_fields to customize data retrieved for components on collection report.
Aliased :pid to :id in SolrDocument.