Added failing unit tests for environment.
Removed old environment implementation in lcpp/core/containers.
Implemented env::create functions.
typeCheck now throws an exception instead of asserting.
Added simple example about continuations (by benni).
Updated unit test framework.
Symbol data now has a raw-data array, in which the ezString is placement-constructed in.
Disabled Environment unittests.
symbol::Data::(get|set){ String => Value }