Adds XTC test resources
Script for executing an XTC job
Adds xtc submit to local-run-as-travis.rb
Adds xtc-submit-ci script to travis CI
Don't build json gem docs on CI
Only run XTC step on ruby 2.1.1

The XTC can be overwhelmed if spammed with job requests.  It is
common to see 3 jobs against 3 rubies executing at once.  That
means 9 jobs submitted against the same device set in only a
few minutes.
WIP remove device sets from encrypted vars