Extract the installer if, for some reason, the symlink wasn't created
Disable environment caching for fundamentals

Use the 'environment_timeout' setting to disable environment caching by
setting it to 0.  Since we are rapidly iterating code in the
Fundamentals course, this ensures there's no delay in compiling and
applying the expected catalog.

The default value is "3m", which may cause stale catalogs, delays, and
confusion.

This applies to the 'main' section of puppet.conf.  It should apply to
each student environment as well as the default 'production' environment
for the initial setup of the classroom.
Merge pull request #314 from casharma/fix/extraction

Extract the installer if, for some reason, the symlink wasn't created
Merge pull request #315 from joshbeard/environment_timeout

Disable environment caching for fundamentals
Add the scripts used to build the LMS AMI

There is still a lot of fiddly manual work that needs to be done. Next
step is to clean that up and automate it end to end. This work can be
abstracted and reused for the virtual classroom.

When done, I'll put in a document with usage instructions.
Fix the regex so bad hostnames don't blow up

This came up on the first public delivery because someone used the name
of '$studentname-master'
Merge pull request #317 from binford2k/fix/poor_regex_wizardry

Fix the regex so bad hostnames don't blow up
Fix the color reset in the ZSH prompt.
Merge pull request #318 from klynton/master

Fix the color reset in the ZSH prompt.
Merge pull request #316 from binford2k/wip/lms_builder

Add the scripts used to build the LMS AMI
Configure irssi & hosts on the master and student

This avoids the proxy resource duplication and avoids over classifying
the student's secondary nodes.
Merge pull request #320 from binford2k/fix/proxy_resource_duplication

Configure irssi & hosts on the master and student
fix for TRAINVM-111 -- backup hosts and network before install and restore on failure
Merge pull request #322 from GeoffWilliams/classroom_setup_hosts_backup

fix for TRAINVM-111 -- backup hosts and network before install
Reimplemented the proxy work

This must have been lost in a previous commit. I cannot find it.
Merge pull request #323 from binford2k/fix/reimplement_proxy_work

Reimplemented the proxy work