Clicking the Save button immediately after changing an owner will now still save the form

Previously, the change event on the owner would prevent the user from
immediately submitting the form, requiring an extra Save click. Now the
save will be queued upon validation of the owner email.
story x51438 change flash error msg for user email
Disabled section mapping from controls
Fixed owners not being saved in the process info edit modal
Added custom tags/attributes for Bleach's HTML sanitization
Moving the updated sanitization to the init_app method
Move `form` element into `section.widget` [story:56545568]

* make `section.widget` be a direct child of `.widget-area`, rather than
  of `form.import`, since every other widget works this way, and
  DashboardController expects it
Merge pull request #316 from reciprocity/feature/fix-import-pages

Recent JS changes broke import; this fixes it
Merge pull request #311 from reciprocity/feature/save_owner

Clicking Save immediately after typing a new owner no longer requires two Save button clicks
Merge pull request #312 from reciprocity/feature/ken_xxxx51438_change_flash

story x51438 change flash error msg for user email entry
Merge pull request #313 from reciprocity/feature/remove_sections_multimap

Re-fixed disabling sections from being mapped via controls
Merge pull request #314 from reciprocity/feature/process_owner_edit

Owners now save properly when editing process info
Merge pull request #315 from reciprocity/feature/wysiwyg_save

Added custom tags/attributes to Bleach HTML sanitization
Controls owned by Directives are now unmapped rather than deleted on unmap