Bug fix, removed Dynamitey dependency, added more tests, all tests check out ok

Bug fixed `isDynamicObject(object)` so that it doesn't throw
`NullReferenceException`. Wrote `invokeGetMember(object, string)` which
obsolesces the need for the Dynamitey dependency. Removed the Dynamitey
dependency. Added additional tests for `DynamicObject`. Confirmed all
tests pass okay.