highbrow.extend can extend a passed in object

```
highbrow.extend('Model', 'User', {});
highbrow.extend(myapp.Model, 'User', {});
```
Remove requirejs, version 0.1.0

Build highbrow.js by combining the source files
together, instead of using requirejs to build.

AMD/requirejs can be supported either through
`shim`, or by wrapping in a define block.

dist/highbrow.js for the browser
lib/highbrow.js for node