merge method added to SortTest
added stack interface
added MyStack
stack added some methods
Some interfaces for simple data structures
completed MyQueue and MyStack
added MyLinkedQueue (uncomplete)
Merge remote-tracking branch 'upstream/master'

Conflicts:
	src/examples/SortTest.java
mylist:complete , myqueue:start
Merge branch 'master' of git://github.com/PeterSchwab/AlgoDataHS13

Conflicts:
	src/examples/MyQueue.java
	src/examples/MyStack.java
first nonworking draft of MyList