I am behind a proxy that uses self-signed SSL certificates and requests should work

[deployable]

I have a custom certificate that does work for all other npm operations but the phantomjs download hits the documented error message. I saw the note in the readme about turning off ssl verification but that's not really a valid fix.

npm supports a custom CA file so the phantom installer should be able to as well.

$ cat ~/.npmrc
cafile=/path/to/blah.pem

Add support for passing cafile through to request

[nicks]

this should be fixed in #296