PSK: Consider renaming PskWriterFactory methods?

[sappenin]

Minor nit, but what does everyone think about renaming PskReaderFactory/PskWriterFactory methods to the following, for clarity:

public static PskMessageWriter getUnencryptedWriter()

public static PskMessageWriter getEncryptedWriter(byte[] secretKey)

Currently, both methods are called getWriter, but it wasn't immediately obvious that calling getWriter without a secret key would return an unencrypted writer (though after thinking about it, the contract does make sense - what else would it return....but it was a bit confusing at first until I looked into the methods to see what they were doing).

[earizon]

@sappenin +1 The more intuitive for library users, the best for all.

[andrew-g-za]

+1