feat: allow connection to self certified SSL HTTPS servers

[asfaltboy]

Preface

Many times organizations use internal jira servers which are secured by configuring https access with a "self-signed" (or otherwise not publicly verifiable) SSL certificate.

Currently, an exception is raised when issuing a command to such a server.

This Pull-Request's main intent is to allow the user to set options which customize SSL behavior; preferably by passing SSLContext where possible (requests does not yet support it as of now, see issue kennethreitz/requests#2118).

Change Details

• passed directly to xmlrpclib.ServerProxy constructor
• requests only has partial support; verify bool option is passed
• SOAPpy: no change -> strangely works without raising SSLError

[trentm]

@asfaltboy As with #23, sorry about this. Obviously this PR is ancient now. In the meantime jirash was re-written in node.js. lib/jirashell.py is dead code that I'm going to remove.