Fix query and aggregation of role implications

* Collate roles and contexts to issue a single query for all
  RoleImplication objects
* Fix aggregation of roles and contexts to handle the case where a user
  has one role in multiple contexts
Made the scrollable area larger for expanded search results
Added beginning of description to PBC Request log entry.
Added a custom jQuery++ build, removed standalone fastfix (jQuery++ includes it)

Includes the following jQuery++ modules:
- animate
- dimensions
- styles
- within
- fastfix
- key
- resize
Added dynamic sizing scrollable search results to the LHN
Adding a LF to jQuery++
Fix imports; fixes unittests

Conflicts:
	src/ggrc/converters/base_row.py
Merge pull request #553 from reciprocity/feature/fix-import-imports

Fix imports; fixes unittests
Fix query when no RoleImplications are needed
Remove `Ownable` from `Help`, `Option`, `Category` models
Merge pull request #550 from reciprocity/feature/pbcRequestBetterLog

Added beginning of description to PBC Request log entry.
Fixed a bug with modals where an exception would be thrown if the modal was closed while loading
Merge pull request #555 from reciprocity/feature/modal_close

Fixed a modal bug where an exception would throw when closing a modal during loading
Add return_to query string to sections.
Add fallback url in case return_to param is missing.
Merge pull request #551 from reciprocity/feature/importRedirectError

Feature/import redirect error
Fix reindexing

* Skip `Response` model to avoid double-indexing
* Filter out non-indexed models
Merge pull request #552 from reciprocity/feature/lhn_scroll_usability

Added usability enhancements for the scrollable search result areas in the LHN
Merge pull request #556 from reciprocity/feature/fix-reindexing

Fix reindexing
Merge pull request #554 from reciprocity/feature/fix-implications-query

Fixups for Role Implications and Ownable models