(CPR-50) Change order of build-data

This commit goes in and changes the fetch.rake task to allow for project
data to overwrite team data. Before it would fetch the project data then
team data from the build-data repo, overwriting anything that is the
same in project. Since we currently do not have any intersections
between project and team datas this should not break anything.
Merge pull request #309 from clantant/RE-2443/master/dataorder

(CPR-50) Change order of build-data
(CPR-8) Rake task for signing gems

This commit adds a sign_gem task in gem.rake that unpacks, sets the
signing key and adds the cert to the chain for the spec file. These are
passed in by environment variables RUBY_PRIVATE and RUBY_PUBLIC
respectively. It then rebuilds it thus signing the ruby gems.