add improvements to autoloader

[josephmancuso]

This adds a 2 new methods to the autoloader and several new parameters.

We can now specify if we want to autoload only objects within our app and not any outside applications:

Autoload().instances(['app/models'], Model)

(this defaults to only classes in our app)

or outside our app too which essentially returns all classes found:

Autoload().instances(['app/models'], Model, only_app=False)

as well as using the collect which will gather all classes and not just instances:

Autoload().collect(['app/models'], only_app=False)

[coveralls]

Coverage decreased (-14.9%) to 76.085% when pulling d2b4ecd on update-autoloader into 7f76d48 on develop.