Handled NULL parameters in Assert methods (#41)
Handled NULL parameters in Assert methods (#41)

#### AssertEquals(), AssertNotEquals() methods
- 'Expected parameter is missing!' Error is thrown if expected parameter is null or missing.
- expectedMoney and actualMoney datatype changed to Money
- removed extra <> for NULLs in error message

#### AssertLessThan(), AssertLessEquals(), AssertGreaterThan(), AssertGreaterEquals() methods:
- As null values cannot be compared, null value in expected or actual parameter is invalid.
- 'Invalid or missing parameters!' Error is thrown if expected or actual parameter is null or missing.
- 'Invalid or missing parameters!' Error is also thrown if expected or actual parameter datatype is not same.
- method comments changed to pass non-null parameters
- expectedMoney and actualMoney datatype changed to Money
- removed extra <> for NULLs in error message

#### AssertNull() and AssertNotNull() methods:
- Added non object parameters(ActualInteger, ActualFloat, ActualMoney, ActualDate and ActualVarchar)
- method comments changed to include variable along with object

bodob/OpenROAD_UnitTestFramework,ActianCorp/OpenROAD_UnitTestFramework