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
Try to explain a littl about crisis management.

Just an incomplete first draft. Needs more detail.
Expand the crisis response section.

Some words abuot how important procdures are for dealing with a crisis.
This is not the place to describe how to create a procedure (that looks
like it belongs in the Business Continuity Planning section under
Disaster Recovery), but it definitely is the place to describe how
useful they are for responding to disasters.
Update sysadmin_tools.rst

firmed up descriptions in byobu section
Merge pull request #84 from inuse/patch-1

Update sysadmin_tools.rst
Import netbooting content, fix code-block
Update contributors
Address some comments brought up by @miketheman. Thanks!
Merge pull request #95 from apeiron/topic/apeiron/troubleshooting

Some words about crisis response
Merge pull request #104 from devicenull/netbooting

Readd netbooting content in new branch