README.md: Convert 'boot camp' -> 'workshop'

Following Amy Brown's [1]:

> We borrowed the "bootcamp" terminology from Hacker Within and also
> various fitness training camps, but as we branch out into parts of
> the world with a more violent recent history I'm less comfortable
> with the term.

The consensus on that issue was to change back to our old 'workshop'
terminology.  The swcarpentry/bc repository hasn't made the shift yet,
but there's no reason I can't embrace the future here ;).

[1]: https://github.com/swcarpentry/bc/issues/240
Merge branch 'master' into bc-namespaced

* master:
  README.md: Convert 'boot camp' -> 'workshop'
Merge branch 'bc-namespaced' of git://tremily.us/swc-setup-installation-test into installation-test-bc-namespaced

* 'bc-namespaced' of git://tremily.us/swc-setup-installation-test:
  README.md: Convert 'boot camp' -> 'workshop'

Conflicts:
	setup/README.md

The conflics were due to Ivan's 'boot camp' -> 'bootcamp' changes [1]
which I hadn't pulled into my upstream installation-test branch.  The
end result (using 'workshop' to refer to our sessions) is the same,
but my upstream history just skips the 'bootcamp' phase.

[1]: https://github.com/swcarpentry/bc/pull/174
Init. commit of (medical) image processing ipynb.
Add height to Eventbrite iframe

and values for when using two rooms.

**The height provided isn't suitable for small screens.**

Close #493.
Made changes suggested by Will Trimble - change Lena for Sally Ride.
Downsampled image to sensible size and removed references to SciPy Lena.
Simplified introduction by removing complicated colourbar placement stages.
Finished cleaning up IPYNB to show Gaussian fit to background.
commit changes before new branch
commit changes before new branch
Merge branch 'master' of https://github.com/ashwinsrnth/bc
Added challenges to lesson 3, need a section on colon operator
Did not actually add files mentioned in previous commit
Added 04-cond and related function files
added challenges
fixed input and output boxes in wrong order
incomplete sentence
Move SSH Key lesson from Git to Extras

Close #691.

After some discussion about have and where to put the lesson that
cover SSH Key I and @wking agree to move it to
`novice/extras/06-sshkeys.md` and just add a note + links to help
students set up their own SSH Key for the Git host they will be using.

This commit includes @jdblischak and @wking wording about HTTPS vs. SSH.
Create reference guide for Mercurial.