DEVELOPER-1017 Upgrade EAP quickstarts to version 6.3.0.GA
Fixed the 'Updating Developer Materials Versions' instructions
Updated Gemfile.lock
DEVELOPER-1020 "fatal: reference is not a tree" error when updating a sub-module
Merge pull request #562 from paulrobinson/DEVELOPER-1017

Developer-1017 Upgrade EAP quickstarts to version 6.3.0.GA