add validate class to tc grunt
full validate
install dev gems
Pull scss-lint back into the build process
Add rbenv magic
Try it in grunt-tc instead
Try a local bundler too
Merge pull request #4927 from guardian/master

Get Ruby Branch up to date
Merge branch 'validate-css-build' into ruby
leave scss-lint in development
correct indentation
also validate on PRs
checking remembered options
remove 'without' rememebered option
no need to output config
removing .bundle
Merge pull request #4923 from guardian/ruby

Teamcity build with newer ruby