Disable support for SSLv2/3

[mark0n]

This fixes #24.

[mark0n]

The failing test doesn't seem to be related to my change.

[shroffk]

yes, that is fine...the error is due to the absence of the .travis file

[shroffk]

were you able to successfully use the client with the channelfinder service.

[mark0n]

I wasn't able to test with master due to some unrelated changes which broke it (at least for my environment). But using a slightly older version (cccf67b), I was able to verify that my change works (connects fine, I get the expected result).

[shroffk]

Ok great,
I will merge this then @shengb