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'.
interstitial ssh examples
Merge branch 'master' into topic/apeiron/sysadmin-tools-ssh
More ssh usecases; explain all of this is secure

I use each one of these, except for -R, every day. The one time I needed
-R it totally saved the day. Make sure the next generation knows what
tools it has.
Two small fixes. Thanks, @avleen!
Add a = to make things happy
Merge pull request #107 from apeiron/topic/apeiron/sysadmin-tools-ssh

Some use cases for openssh