Start using generated standalone penthouse.js

The (standalone) penthouse.js is now generated,
thanks to the work of @fatso83 
The generated file has all required penthouse modules inlined,
meaning this single file can continue to be used standalone,
called from the command line, without installing Node.

This means we no longer have to maintain two single files
(lib/penthouse.core.js and penthouse.js)

Once again, thanks @fatso83!
As far as I can remember, the reasoning was that although my changes supported multiple urls, the work was not complete as a whole, and the original interface (command line style) was still supported/unchanged. So therefore there was nothing new to anyone - thus not mandating a new major version.

Now, on the other hand, I am totally in favor of upping to a new major version, *once we finish all changes in the dev branch*, getting rid of old cruft.

Ref the other issue on backwards compatibility (we have version numbers, so why let the old stuff hold us back?).