Assertion failure when sending a null chunk
Fixed memory leak on message decode

- was not destroying frame properly
Fixed signatures for destructive methods

- _set_ frame/chunk/msg now take reference pointer
- nullifying this after taking ownership, per standards
Added _get_ method to return structure properties without copying

* Also changed _set methods on structures to nullify reference
Minor tweak
Merge pull request #28 from hintjens/master

Various fixes to generators