Bug 968247 - Use spot instances for regular builds. r=catlee
Adjust c3.xlarge spot price
Bug 969590 - Temporarily revert the change to m3.medium AWS instances to see if they are behind the recent increase in test timeouts
Use m1 to for new tst-linux64 instances
Merge branch 'master' of https://github.com/mozilla/build-cloud-tools into sanity-checker