Added screen usage
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