Added canary script and samples.

tools/canary/canary-test.json

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+{
+    "version": "0.1",
+    "alerts": [
+        {
+            "affectedVersions": [
+                "io.ethers.app/0.1"
+            ],
+            "heading": "Warning",
+            "text": [
+                "This is a test of the **emergency canary** system.",
+                "This is only a drill.",
+                "",
+                "If this had been a real emergency, this would have included the problem and possible solutions.",
+                "",
+                ""
+            ],
+            "button": "I Agree"
+        }
+    ]
+}

tools/canary/canary.json

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+{
+    "version": "0.1",
+    "alerts": [
+    ]
+}

tools/canary/canary.raw

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+0xf86680808080809d7b2276657273696f6e223a22302e31222c22616c65727473223a5b5d7d1ba03f0e5fb1ee9adb9e689b0d1a5ad4566ea91915007b1c43ab59369c40cc82d26fa02a49304771de9f5777cd34cdc5e2098df3027f11f6c1019f00241bdef89f7765

tools/canary/index.js

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+/**
+ *  Canary
+ *
+ *  The canary file can be uploaded to https://ethers.io/canary.raw
+ *  in the event a serious bug is discovered that users must be warned
+ *  of.
+ *
+ *  It must be signed with the private key for the address:
+ *
+ *      0x70C14080922f091fD7d0E891eB483C9f8464a527
+ *
+ *  TODO: This needs to be updated to take a secure password from
+ *        readlineSync rather than the command line.
+ */
+
+var crypto = require('crypto');
+var fs = require('fs');
+
+var Wallet = require('ethers-wallet');
+
+var jsonFilename = process.argv[2];
+var password = process.argv[3];
+var canaryFilename = process.argv[4];
+
+var canaryData = fs.readFileSync(canaryFilename);
+canaryData = JSON.stringify(JSON.parse(canaryData));
+
+var transaction = {
+    nonce: '0x00',
+    gasPrice: '0x00',
+    gasLimit: '0x00',
+    value: '0x00',
+    data: (new Buffer(canaryData)),
+}
+
+
+Wallet.decrypt(fs.readFileSync(jsonFilename), new Buffer(password)).then(function(wallet) {
+    var data = wallet.sign(transaction);
+    var hash = crypto.createHash('sha256').update(new Buffer(data.substring(2), 'hex')).digest()
+
+    console.log('Address:     ' + wallet.address);
+    console.log('Hash:        0x' + hash.toString('hex'));
+    console.log('Filename:    canary-' + hash.slice(0, 4).toString('hex') + '.hex');
+    console.log('Data:        ' + data);
+
+}, function(error) {
+    console.log(error);
+});

tools/canary/package.json

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+{
+  "name": "ethers-canary",
+  "version": "0.0.1",
+  "description": "Script to generate and sign the https://ethers.io/canary.raw file.",
+  "main": "index.js",
+  "dependencies": {
+    "ethers-wallet": "1.0.10"
+  },
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "Richard Moore <me@ricmoo.com>",
+  "license": "MIT"
+}