HUE-2186 [search] Bulk edit collection templates

Moved inline style from admin_collections.mako and replaced with classes.

.hueCheckbox: Reverted to display: block after noticing subtle behavioral changes
.coll-heading: new class added to address vertical alignment of table heading in conjuction with copy/delete links pulled-right

Copied methods for toggling checkboxes from indexer.

Removed console logging used for debugging

toggleCollectionSelect(): updated references from collection.name to collection.id to enable toggling of individual checkboxes

collections.js: addded methods to handle bulk actions (markManyForDeletion, deleteCollections, copyCollections); will modify remove unused methods later
admin_collections.mako: removed existing templates and added table with check boxes and single, bulk-action buttons/links (copy, delete); removed inline styles
search_controller.py: added bulk action methods (delete_collections, copy_collections)
HUE-2186 [search] Bulk copy collection templates
HUE-2186 [search] Bulk copy collection templates

collections.ko.js: Fixed assignment of values to self.isLoading to use setter argument instead of assignment operator. (line 114)
admin_collections.mako: Removed list and replaced with table; Added Solr index as well as shared status columns; converted batch process links to buttons; removed trailing spaces
hue3.css: ported inline styles to style sheet
views.py: updated to include solr index and shared status with object sent to admin_collections.mako
search_controller.py (Romain): Updated copy and delete processes to handle multiple collections; removed trailing spaces