Code in charge of bootstrapping contexts is not testable

[mikeseghers]

In our examples and documentation we suggest bootstrapping context in the form of:

[someObject ocsBootstrapAndBindObjectContextWithConfiguratorFromClass:[SomeContextConfiguration class]];
[someObject ocsInject];

While this code avoids a lot of boilerplate, it makes the class responsible for bootstrapping less testable. We need some indirection to make the code independent of the NSObject categories.