Update Dependencies

Updating:

- Q promises
- HTML Entity parsing
- CSS Parser
- HTML Parser
- HTTP Client
- UglifyJS minifier
- Express
- Optimist option parser

With the following bug fixes:

- HTTP clients were not being returned to the pool, exhausting our resource (and hanging the worker)
- Font incorrectly included as image/png (though we don't correctly handle a property having multiple remote URLs, so fonts are likely still broken)