Fix minified build

[alerque]

The minified build currently breaks the auto-update system in several ways. First the build props need to support setting the auto-update URL to the version being used. Secondly a number of variables and functions need name protection across releases. Lastly it needs to stop stripping out "apparently unused" code bits. Just because a variable is assigned and not used in a function doesn't mean it isn't referenced externally.

[oliversalzburg]

Please check out #26 and tell me what else needs to be fixed.

What variable names need to be preserved?

[alerque]

At there very least VERSION needs to be preserved, but I tried referencing it with window["VERSION"] and it still got munged. I think I already included a way for URL not to matter, but there was one other too. I'll post if I can remember what it was.