Converted CLI script into a library. The goal being to make it easier to maintain and add new subcommands.
Streamlined configuration. Moved S3 logic to internetarchive.ias3 module.
Fixed bug: _get_config() should retrun an empty dict if a config-file can't be loaded, instead of None.
Added sort option and parameters option (for submitting extra paramters with your request).
Removed global url variable.
Merge branch 'develop'