All filetypes may now import from file if 'import_file'. Unit tests added. INI
may now be loaded from str. PEP 8.
Remove duplicate .export method
automatic file type detection, if none assume python dict
Merge pull request #8 from tony/import-file

Automatic file detection. Import files for JSON, YAML. Import str for INI. Unit tests. PEP 8 / Fixes.