Improve class names, especially for documentation

[hunterlester]

Documentation readability could be improved by removing Interface from class names.
For example, scan your eyes down this vertical list:

AuthInterface
CipherOptInterface
CryptoInterface
ImmutableDataInterface
MutableDataInterface
WebInterface

vs.

Auth
CipherOpt
Crypto
ImmutableData
MutableData
Web

Also, I propose that MutableDataInterface becomes MutableDataContstructor to clarify what it's methods are responsible for.

Reader and Writer classes could provide clarity by being renamed to something like IDataReader and IDataWriter.

[b-zee]

IDataReader would imply it's an interface. Interfaces shouldn't be instantiated, right? What then do the create and fetch return from ImmutableDataInterface?