contact.rst: correct email addr. for dev list

The email address for both the general discussion and dev lists were
zerovm@googlegroups.com. The correct address for the dev list is
zerovm-devel@googlegroups.com.
contact.rst: correct grammar

The google group instructions ask people to "signup". "Signup" is a
noun, not a verb. The correct way to write this is "sign up".
Merge pull request #23 from larsbutler/fix-contact

Fixes to `contact` page
clitools: link to zerovm-cli subproject on rtfd

... instead of the git repo, now that we have zerovm-cli docs published
on readthedocs.org.
zebra/tutorial: install zpm from PyPI

We can do this now instead of installing directly from git (using pip).
Merge pull request #24 from larsbutler/add-zerovm-cli-subproject

clitools: link to zerovm-cli subproject on rtfd
Merge pull request #25 from larsbutler/update-zpm-install-instructions

zebra/tutorial: install zpm from PyPI
moved the order of the tutorial in the Zebra documentation
added details about accessing and interfacing with Zebra
Merge pull request #26 from byeager/master

Accessing Zebra Content
Improved language in section on accessing Zebra
Example authentication

When I first tried the tutorial I found myself at a loss as to how to specify the auth params ([ZeroCloud Authentication Config](https://zerovm.readthedocs.org/projects/zerovm-zpm/en/latest/zerocloud-auth-config.html) was several clicks away) and what values to use for the params. Some examples makes it much more clear.
Merge pull request #28 from everett-toews/patch-1

Add example authentication to zebra tutorial
Merge remote-tracking branch 'upstream/master'
added system map glossary entry
Merge pull request #29 from byeager/master

Minor improvements to Access Zebra & Glossary
clitools: fix broken links (fixes #30)

ReadTheDocs does not automatically redirect from /projects/foo/ to
/projects/foo/en/latest/ the same way it redirects when you access the
documentation as foo.readthedocs.org.
clitools: wrap long lines
Merge pull request #31 from mgeisler/fix-cli-tools-links

Fix cli tools links
Update access.rst

Two-factor auth for gmail does not work. Must have account without two-factor auth.