Merge license
Merge README
Remove duplicate link
Reduce the TOC level from 9999 to 3

[FIX] Reduce the TOC level from 9999 to 3 to fix Adobe Reader 9 or later
      refusing to open with the error "error reading this document (14)."

      This error is possibly due to more restrict attitude toward malformed PDFs
      in Adobe Reader 9 and is not found in Adobe Reader 7, Evince (2.28.2),
      and Preview.app (Mavericks).

      For general consumption, this fix is required.