Backends can be specified at instantiation time through options
Small linting error on index.js
Consistency with coding style
Use options instead of opts
Merge branch 'patch-2' of git://github.com/lemonzi/backbone.io into lemonzi-patch-2

* 'patch-2' of git://github.com/lemonzi/backbone.io:
  Consistency with coding style Use options instead of opts
  Small linting error on index.js
  Backends can be specified at instantiation time through options

Conflicts:
	lib/browser.js