Merge pull request #5 from gmaxwell/ecdsa1

Adds a sage notebook for ECDSA signing and verifying.

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@@@ -29,9 -29,13 +29,14 @@@ Papers of interest
  <ul>
  <li><a href="https://github.com/citp/bitcoin-sok">Bitcoin systematization of knowledge</a>
  <li><a href="http://freico.in/docs/freimarkets.pdf">Freimarkets: a bitcoin extension to support user issued assets, p2p lending, options and more.</a>
 +<li><a href="https://download.wpsoftware.net/bitcoin/wizardry/cryptonote-whitepaper.pdf">CryptoNote Whitepaper</a> containing an innovative ring-signature scheme</li>
  </ul>
  
+ <a href="http://sagemath.org/">Sage</a> notebooks:
+ <ul>
+ <li><a href="secp256k1.ecdsa.sage">ECDSA with secp256k1</a>
+ </ul>
+ 
  Edit this page at <a href="https://github.com/TheBlueMatt/bitcoinninja">https://github.com/TheBlueMatt/bitcoinninja</a>
  
  </body>