Tell people not to be the BOFH.

This is a start to the "how not to be a sysadmin" section. I've tried to
achieve some balance between useful guidance and preaching.
content for airco, security in datacenters

Filled some content for review
Update sysadmin_tools.rst

adding byobu usage
line length, description

lines wrapped at 80 chars, added short description about Byobu and why
you should use it
A few minor things before getting into ssh stuff.

* Add mention that one's environment can dictate the tools one uses.

* Small blurb about iTerm 2.

* Fix 'previous' typo; should've been 'precious'.
Added screen usage
Added screen usage
converted action items to todos. removed duplicate lines
forgot an extra line
Merge remote branch 'upstream/master' into earthgecko
Added screen usage example, styling and s/bash/console/
Changed all '.. code-block:: bash' strings to '.. code-block:: console'
Modified:
config_management.rst
cron_101.rst
databases_101.rst
monitoring_201.rst
shell_tools_101.rst
sysadmin_tools.rst
unix_signals.rst
Removed console_output lexer
Merge pull request #85 from earthgecko/earthgecko

Added screen usage
interstitial ssh examples
Add a conventions document.

This will contain the style guide (once it's written) and presently
contains the beginnings of a standard example network. The diagram still
needs some work, but all of the important machines are present.
adding initial content to hardware
Point people at github's git docs for now

We'll want to actually cover git and github in the curriculum, for sure.
For now, pointing people to the docs Github have already written should
provide at least some useful info. I've also pointed people at the IRC
channel if github's docs are insufficient.
Fix the tyop, thanks Mike
Merge pull request #91 from apeiron/topic/apeiron/git-github-docs

Point people at github's git docs for now