Open source is insecure, and other FUD

@gbinal, @konklone any other common arguments to debunk?

Fixes #66.
This is good, but never quite gets around to saying that open source can be made by other than 1-person potentially-in-mom's-basement dudes. Suggestion:

> Major projects like Linux, WordPress, and Drupal are built by teams of professionals and hobbyists, relied on by thousands of for-profit business, and have "suits" supporting them, to ensure their success.