Implement a way to list all features of all dependent packages

[quinn]

in another thread, cargo read-manifest followed by parsing the JSON yourself was suggested. I'd be ok doing that, but it also doesn't seem to work. No features are listed in each create in the json, from what i can see.

[damccull]

@quinn, You might want to check out cargo-whatfeatures. It shows all the features for a specified packge.