v0.2

Changes

• New responsive Vue based UI for visualising output under demo/vue-viewer
• New pdf extractor option: pdfminer
• New image extractor option: google-vision
• Multilingual documentation (starting with Chinese for now)
• Better naming of different areas (input, output..) of the pipeline for easier code understadability.
• Improved header detection
• Externalized default configuration files for modules (module/abc/defaultConfig.json)
• Several bugfixes