Commit the hodgepodge of scripts to run the cell server on a computer.

At the top-level, run the restart command in the directory.

Use the check_sagecell_server command in a cron script to reboot the server if it's down.
Organize todo list
Reorganize extensions
fix wrapping
fix formatting
Fix todo formatting
Elaborate on rate-limiting strategies
add selinux links
Dokuwiki plugin for the sage cell
Fix dokuwiki plugin to autoresize codemirror.
Architecture diagrams using draw.io
Upgrade to IPython master (but make changes backwards compatible with older IPython versions)
Fix some timeout issues and other issues with the sagecell-client example.

Thanks to sdenton4 on github for pointing out the timeout problems (see gh-401)
Add people working on todo list.
Include current installation instructions

Fixes gh-344
Merge branch 'master' into memstore
resolve /permalink in the permalink server to be compatible with the cell server itself