Refactoring of CPU

Added tests in CPUTest
Introduced JUnit-4.11 and hamcrest-1.3
in progress(1)
Refactoring CPU(2)

Writing tests in progress...
testSETFIELD fails.

In progress(2)
Implementation of setField

ClassData#setField
Refactoring CPUTest(3)

Removed unnecessary calls of System.out.println(...)