remove obsolete comment
analyze json expression tree
remove unused code
integrate 1op and mOp functions
integrate constants with 1/multi op
remove unused code
move function resolving to FunctionNode object
extract function stuff to separate file
remove unused code
add scalatest to build
evaluate prints out the functino
first mockito/scalatest tests
test for constants
WIP - tests for sin and +
fixed function tree evaluation
refactoring tests
minus function test
fixed div and mul
div test + removed printing out operands
cos test