add support for adding a new page
start aloha using pristine content
Always display an error code on error
Merge pull request #399 from Connexions/display-forbidden-error-codes

EDITING: Always display an error code on error
Remove dead code
Merge pull request #396 from Connexions/editing-workspace-add

EDITING: Add new Page to workspace
Merge pull request #398 from Connexions/editing-start-clean-aloha

EDITING start clean aloha
Don't attempt to save subcollection models
Ensure models nested in a subcollection are still saved