Crypter.java: Document a method and change version date.

Document the method that changes input text to crypted form and
change the version to match the date.

Signed-off-by: Raido Roomets <raido.roomets@cs.tamk.fi>
Crypter.java: Add feature to change received string to upper case.

Add feature to toMorse method which will change all received
characters to upper case. This will make it possible to receive
user input as both capital and small letters.

Signed-off-by: Raido Roomets <raido.roomets@cs.tamk.fi>