Mild refactor of erasure package.

Naming now reflects the idea that multiple types of erasure can be
included. Additional error checking has been added. Unneccessary error
checking has been removed (unnecessary becaues the variable types were
changed to more restrictive types). The many line merge sort was
replaced by 15 lines of code that perform a much simpler and O(n)
collapse sort.
Merge pull request #171 from DavidVorick/review

Mild refactor of erasure package.
allow client to select bootstrap ID

TODO: implement an RPC "Ping" to allow for ID-specific pinging.
Currently, the client will report "Successfully Connected!" even
if the ID is wrong.
Add Disconnect method to Client