Look at all this stuff we weren't using.

This class removes all of the loader classes which became unecessary after we removed the AGAuthenticationModule and switched to registrations.

Additionally, it removes the references to support classes.  It also removes relevant tests.

In theory the loaders should still be used for digest authentication when an Activity is killed during login, but that is such a narrow use case for a narrow use case that we should probably find a lighter way around that.

#Testing
needs core and pipe
mvn clean install should give no errors.