Connecting Environments and Contexts.
* Store ShiftArray contents in physical order corresponding to logical bit ordering.
* Allow ShiftArray to clone to different size array.
Adding some tests for ShiftArray.
Adding __str__ to string methods for Environment and Context.
Changing BinInt to rely on ShiftArray's internal offset indexing.
Extending BinInt clone/copy to generate output of user-specifiable length.
Merge pull request #6 from ewh/develop

Develop