send raw worksheet items.
added save endpoint. WIP
Toggle raw mode on worksheet details
Merge branch 'feature/worksheet-raw' of github.com:codalab/codalab into feature/worksheet-raw
Return raw with newlines
Dynamic height of raw textarea
able to save worksheet raw
update and fetch.
Click raw, click off and saves.

fix for codalab.common.PreconditionViolation
Turn off keyboard shortcuts in raw mode
Merge branch 'feature/worksheet-raw' of github.com:codalab/codalab into feature/worksheet-raw
half done
Delete item from raw and from items
Update raw when moving items
Insert (add raw item) on save of edited markdown item
Editing and Saving.

Still buggy
Merge pull request #679 from codalab/feature/worksheet-raw

Editing and saving a worksheet raw.