- new version; 0.5.1!
- changed ActiveEventArgs to allow for changing Args from client code
- implemented support for overriding Active Events and "CallBase" on
  Active Events
- significantly refactored and simplified ApplicationContext, plus
  optimized it. also now supporting "call base" and polymorphistically
  overriding Active Events
- simplified "Loader" class to optimize unloading, and refactor code to
  make it easier to understand
- updated lots of the comments in phosphorus.core
- added tons of additional unit tests for ApplicationContext and Loader
  classes