Removing old restuctured text handler and web service.
Merge pull request #3225 from ellisonbg/removerst

Removing old restuctured text handler and web service, that are completely unused.
Text in rename dialog was way too big - making it <p>.
Merge pull request #3226 from ellisonbg/renamedialog

Text in rename dialog was way too big - making it <p>.
fix typo
Merge pull request #3228 from maximsch2/fix_parallel_docs_typo

Fix typo in IPython.Parallel documentation.
The HTML output type accidentally got removed from the OutputArea.

This commit adds it back at the approp. point in the
OutputArea.display_order.
Merge pull request #3229 from ellisonbg/htmloutput

The HTML output type accidentally got removed from the OutputArea.