Possible Issue on HTTPS default home pages

Saw this when using twitter as an example:

```
$ ./phantomas.js --url=http://www.twitter.com

SECURITY_ERR: DOM Exception 18: An attempt was made to break through the security policy of the user agent.

  phantomjs://webpage.evaluate():2
  phantomjs://webpage.evaluate():3
  phantomjs://webpage.evaluate():3
SECURITY_ERR: DOM Exception 18: An attempt was made to break through the security policy of the user agent.

  phantomjs://webpage.evaluate():2
  phantomjs://webpage.evaluate():3
  phantomjs://webpage.evaluate():3
SECURITY_ERR: DOM Exception 18: An attempt was made to break through the security policy of the user agent.

  phantomjs://webpage.evaluate():2
  phantomjs://webpage.evaluate():3
  phantomjs://webpage.evaluate():3
TypeError: 'undefined' is not an object (evaluating 'smallestResponse.bodySize')

  /Users/john/Sites/phantomas/modules/requestsStats/requestsStats.js:53
  /Users/john/Sites/phantomas/lib/modules/events.js:88
  /Users/john/Sites/phantomas/core/phantomas.js:169
  /Users/john/Sites/phantomas/core/phantomas.js:364
  /Users/john/Sites/phantomas/core/phantomas.js:162
```