Upgrade to cson-safe v1.0.0

The big change in v1.0.0 is that cson-safe now uses coffee-script
instead of -redux for parsing. This leads to less confusing behavior in
the subtle cases where -redux does not match coffee-script behavior. It
also collapses the dependency tree from a gazillion packages down to
one.
Merge pull request #1 from jkrems/jk/cson-1.0.0

Upgrade to cson-safe v1.0.0