Small fixes & refactoring:

[bryanchriswhite]

• Readme typo fixes
• Readme updates
  • remove gpg --export-secret-key step (don't think it's necessary and shoudn't be done if not)
  • use npm <script> instead of node <file>
  • wrap commands in backticks
• Update npm start to call main.js (server.js has moved and isn't the entry point anymore
• Refactor setup
  • use path core module instead of manual string maniuplation
  • fix broken references
  • factor out common logic between async filtering/mapping over keyfiles
  • remove shadowed callback vars and rename to next and done where appropriate

[phutchins]

Awesome fixes! Thanks.