renamed CG::IdenticalZero() and CG::IdenticalOne() to CG::isIdenticalZero() and CG::isIdenticalOne()
added new template operators for arithmetic operations
minor formating improvements
new evaluator method that uses arrays instead of vectors
added a new pow function for pow(int, CG)
use C++11 to initialize vector values used in operation tests
improved the creation of conditional expression
adapted to API changes in CppAD