chapter 8 tests
8.14 Prop for List.sorted
The Scala Dreaded Underscore
8.14: Prop for List.takeWhile
8.14: Prop for List.takeWhile
tests for chapters 8,13
8.1,2 ScalaCheck Prop
14.1 STArray.fill
test for 14.1 STArray.fill
tests for exercise 14.2
tests for exercises 15.1, 15.2
tests for exercises 15.3-4
14.3 STMap
tests for chapter 15
15.12 Process.join
use Gen.choose for arbTree
added link for Scala's assert
flatMap that sh..
9.9 added tests for json parser
first 6 chapters

Signed-off-by: Joern Bernhardt <jb@campudus.com>