patched around requests bug and ssl verifitation

Release version 1.2.7

Updated version and changelog.

Updated rev to 1.2.5

Another broken test

0 != None. This is now important for exports.

Amended plugin_id check. fixed typo.

Updated rev per breaking issue tenable#226

tests passed, release version

Merge branch 'master' of github.com:tenable/pyTenable