Fix test value-casting-operators
add test: 007-Iterate-internal-array.phpt
Iterate internal array
add test variables/005-cast-objects-to-scalars.phpt
add test: class_obj/003-comparable.phpt
add test: 004-static-funct.phpt (Test class with static function)
Changed the structure of the test file. With the increasing number of tests the old structure became uncomfortable.
add new tests: Test call function
add test: 018-calling-php-functions
new test: Test class with static property and class constant
Fixed test: variables/003-value-types
Merge pull request #56 from valmat/tests

New tests