Adding more questions to FAQ based on suggestions from current instructors.
1.  Adding a rule to build into ~/dev.software-carpentry.org for testing on the server.
2.  Removing rules to manually copy CSS, Javascript, and image files (Jekyll does this).
1.  Updated Makefile to match latest version of Jekyll, and added PyRSS2Gen.py to the bin directory to build on servers.
2.  Moved Disqus and footer include blocks into Bootstrap layout so that they'll format properly.
3.  Moved EventBrite registration to an _include file.
4.  Updated legacy bootcamp pages to reflect these changes.
Fixing name of slideshow layout file for Version 3 notes.
Putting base URL for mailing list management into configuration file.
Modifying Makefile to build local, dev, and install versions
Removing Disqus comments from home page
Past bootcamps are now linked properly
Removing Disqus comments from archived bootcamp pages
Logos for sponsors and instructors weren't showing up because
{{page.root}} in the included files wasn't being expanded, even though
it's expanded everywhere else they're used.  Setting 'root' manually
in the bootcamp header fixes this for unknown reasons.
Merge branch 'master' of https://github.com/swcarpentry/site
arokem updates