Factory initialization directly with Renderer

[MGreek]

I made some changes to Factory such that FactoryOptions can now accept an instance of Renderer.

This fixes #580.

[ronyeh]

Minor comment: Can you fix the typo in the second commit message?

allow initilalization => allow initialization

Do you have a small-ish example of using this new API? Either a JSFiddle or a snippet of code from a website you're building would help.

Thanks!

[ghost]

Fixed the typo. I'll also try to do an example next.