Add __init__ file to permit import as module
Introduce storing of API key in separate (ignored) file

Storage of personal API token is moved into separate file, using .gitignore
to prevent its inclusion in the repository
Fix occasional UTF-8 encoding-related bug

Occasional error was encountered due to mismatch of string encoding, which is fixed my explicitly encoding all retrieved text to UTF-8.
Merge pull request #2 from nickfyson/develop

Fix for UTF-8 encoding error (and some other tweaks)