Updated python code to align with vault module
Updated `libexec/softlayer': flag for cache added

Added a programatic flag (variable) to enable/disable caching, and
set that to false as softlayer API calls are not too costly.
New `module/softlayer'

New site module that interfaces with `extern/softlayer'.
New `module/mongo'
New `module/tunnel'
New `module/pagerduty'
New `module/capistrano'
Updated `travis'

Moved some package installs into the specific module requiring it in
order to reduce the shared build commands, thus speeding up all
builds as a result.
Updated `README.md': reflect current status