5.1.2
changes for 5.1.2 release
Fix typos
Apply FullLoader/UnsafeLoader changes to lib3
Make default_flow_style=False
Fix for bug https://github.com/yaml/pyyaml/issues/118
scanner: use infinitive verb after auxiliary word could
Remove commented out Psyco code
Adding an implicit resolver to a derived loader should not affect the base loader (fixes issue #57).
Support escaped slash in double quotes "\/"