RED - test isJsonObject().
GREEN - isJsonObject() implemented.
Merge branch 'master' of https://github.com/AntonAnd/2DV110_Assignment1.git
RED - testing isJsonArray()
GREEN - isJsonArray() implemented
REFACTOR - Removed empty constructor in TreeNode and changed code in
TreeNodeTest that involved empty constructor object.
RED - tested constructor with null value.
GREEN - constructor now throws nullPointerException
REFACTOR - Added javadoc to TreeNode.
RED - test isJsonPrimitive
GREEN - isJsonPrimitive implemented.
REFACTOR - added javadoc to QueueClass.