Custom-text-test-runner

Patch to address 1

- exception handling in case no execution time is available for results

- fixes to make the package work
- get_function_args method was missing and store_class_fields was receiving too many arguments

- moved source of package to **init**.py to avoid needing to import by using `from custom_text_test_runner.custom_text_test_runner import CustomTextTestRunner`
- modifications for PyPI upload procedure to display mardown README correctly

- adding tag/release to allow submitting to PyPI