Support Custom CA Bundle (Self Signed Certs)

[Ian Woloschin]

Looks like support for self signed certs was inadvertently removed in the last day or two. Opening an issue to track, if no one else gets to it first I can probably make a PR within a couple of days.

[Tom Christie]

Thanks yeah - I think it got accidentally dropped amidst something else.
A PR here would be very welcome.

[Ian Woloschin]

Closed via #34.