Potential improvements

[bitspill]

• Replace hard coded values with command line parameters or env vars
• • Faucet VBK address
• • Node Core connection details
• • HTTP listen address
• • Payout amount
• Improve error handling
• Refactor to smaller functions (rather than mega-main)
• Validate submitted VBK address
• Add info about VBK development to html
• Document how to run/edit a faucet instance