Fix incorrect reference to clojure.java.shell
qc2 edits
qc2 edit
adding xsl to change xref style, rebreaking book accordingly
Merge branch 'master' of https://atlas-server.oreilly.com/git/1234000001500 into atlas-master
frontmatter tweaks
Merge branch 'master' of https://atlas-server.oreilly.com/git/1234000001500 into atlas-master
Add --no-check-certificate to wget commands

wget fails on some systems as it does not recognize gist.github.com certificates, etc.
Updated to use curl -L -o instead of wget

curl is the default on OSX systems and almost guaranteed to be installed on Linux systems (and if not, easily installable.)

curl -L is necessary to follow redirects for gists, otherwise the syntax is remarkably similar.
Merge #367, with a few tweaks

* Use long-form curl options for clarity (e.g. -L vs. --location).
* Make curl silent with --silent.
* Quote parameter substitutions (best practice).
Merge branch 'shalicke-patch-1'