Add return value to getValidLink function.
Add getting right url value from GetValidLink.
Add alias to module.
Add default value to -d parameter.
Add necessary import of "sys"-module.
Add import of sys module, also rewriting of GetHTMLContent function, add some new function
prototype for future.
Expand GetHTMLContent functions(with emtpy Logger), add better exceptions handling, also add
support of "https"-type links for urllib.request.
Base for logging functions file.