Closes #11 created test class to help focus and understanding of bytes
#8 Created empty constructor for Message with one parameter
Merge branch 'master' into issue4-message-abstraction
Javadoc for CMD_SIGN_ON #15
Closes #16 added method isValidChecsum
Merge branch 'master' into issue4-message-abstraction
closes #8 created constructor for incoming message of variable lenght
#4 refactoring
closes #13 created getBody()
closes #14 created getter for sequence number
#4 Fixed constructors.
Get updated Message code
Receiving #10

 * Update method names to match changes in Message
 * Add extra return statement in read()
 * Add reminder to check read() logic