Update README.md
Update README.md
added more code samples to ch30 - JMS
Merge branch 'master' of https://github.com/yfain/java24hourtrainer2ndedition
minor change in TestHashtable lesson 11
modified examples to ch11 and 12 (program to interfaces)
renamed packages in ch13, added imperativefunction pkg
Updated code in ch14
Added Girlfriend1 and started Lesson19
Added FXML and controller to Calculator in lesson 19
Programmed a Tic-Tac-Toe game in JavaFX
Cristina's changes to DirectMessageSender
Merge remote-tracking branch 'upstream/master'