Doesn't Validate TLS

Restkit does not validate TLS which means it's HTTPS handling is broken and insecure.

``` python
>>> from restkit import request
>>> r = request("https://tv.eurosport.com/")
>>> r.body_string()
'<HTML><HEAD><TITLE>Error</TITLE></HEAD><BODY>\nAn error occurred while processing your request.<p>\nReference&#32;&#35;102&#46;34e74217&#46;1426170776&#46;e615a32\n</BODY></HTML>\n'
```
