gobox 0.2.0

• Added HTML, JS, CSS files to the zip. Now there is a frontend for the server.
• Switched to XHR requests to track upload progress
• Added regexp filtering to avoid invalid filenames and exploits
• Added -ip flag to set the ip the server will run in.

To use this version, extract the zip to its own folder. It must contain the templates and static files to load the frontend.