Changed name of equal_identifier to is_identifier.
Added new functionality.
Updated for changed header file name.
Added macros to test for numbers and enamed header files.
Added is_number testing.
Update to is_identifier test.
Updated tests.
Added begin_number tests.
Corrected header inclusion.
Added after_parens test.
Correction for after_identifier code and tests for after_identifier.
Tests for after_number