Added beginning of description to PBC Request log entry.
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
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
Resolve merge conflict.