Removing Weird Magic Method

The asymmetry of Fourmyle\Application’s __get/__set is weird, so the
__set has been removed. Minor refactoring in the logging system.
Router Closure Support

Support for closures (instead of the clunky ClosureResponder) has been
added to the router service. The README has been updated to match this,
and the tests have been amended accordingly.
Finishing the Router Updates

The tests for the router have been completed. Very minor tweaks, but
mainly just adding the new tests.
Merge pull request #1 from tomalom/dev-master

Merging in router updates.