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
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.
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.
Expand on shell portability concerns

- Explain the difference between /bin/bash, /bin/sh, and /usr/bin/env bash when specifying an interpreter for a shell script.
Wrap string literals per review comments,
Explain what the hashbang is and why it's important
Make bash manual a link, rather than have the link floating off in space.
adding empty windows_101 section and mentioning windows in the "how to become an engineer" page
Two small fixes. Thanks, @avleen!
Merge pull request #110 from avleen/careers

adding empty windows_101 section and mentioning windows in the "how to b...
Add in a blurb aboud Diamond to the monitoring 101 chapter
Merge pull request #111 from kormoc/diamond

Add in a blurb about Diamond to the monitoring 101 chapter
Add a = to make things happy
Merge pull request #107 from apeiron/topic/apeiron/sysadmin-tools-ssh

Some use cases for openssh
Draft out a description of upstart

This is a short description of how upstart works. I provide an
example of starting an httpd.
This description is not intended as a replace of upstart's documentation

Missing: links to that documentation would be grand..
Typos, corrections and rewording

rebase against master.

rewrite intro, to be less awkward and actually fully cover upstart's
functionality.
file-system -> filesystem. Remove commas in places where they don't
belong, and add them to places where they do belong instead.
Explain show-config output.
prefer repository over repo
prefer GitHub over github