fixed _.bindAll functions to work with latest underscore (1.4.4)

_.bindAll now requires a function list to be passed in, like so:

`_.bindAll(this, _.functions(this));`

4 usages of _.bindAll were updated here, 1 usage left alone in ModelBinder.js line 503 (below), as it is passing in its own function name:

`_.bindAll(this, 'convert');`