Patch YAML to allow only some Gem classes to be unmarshalled
Catch and report YAML exploit errors separately
Revert "Temporarily disable pushing"

This reverts commit 3fe95b2e24171f0325e023e08d5472c3977e7b2b.
Add a test for exploit preventative behaviour
YAML's scalar parsing yields numbers sometimes, which are erroneous but should be caught cleanly
Clarify whitelist of classes
Make sure preloaded tag coders are whitelisted too
Merge pull request #516 from sj26/whitelist-yaml

Whitelist YAML classes demarshalled from metadata Edit