Remove magic properties support
Remove magic properties support

Before this commit, properties were resolved into getters/setters
when appropriate. It was a convenient (in some cases) way to describe
getter, but breaks initial idea of "PHPSpec2 is development framework"
as in case if method is not defined, `PropertyNotFoundException` would
be thrown instead of `MethodNotFoundException`.

phpspec/phpspec2-proof-of-concept,phpspec/phpspec2-proof-of-concept,phpspec/phpspec2-proof-of-concept