Fix eslint errors

This was done by:
- updating some devDependencies
- running:
    node_modules/.bin/eslint -c ./eslintrc --fix src/ test/
- adding where necessary:
    // eslint-disable-line strict

packages/ripple-keypairs/package.json

@@ -24,18 +24,18 @@
     "assert-diff": "^1.0.1",
     "babel": "^5.8.20",
     "babel-core": "^5.8.20",
-    "babel-eslint": "^4.0.5",
+    "babel-eslint": "^6.0.0",
     "babel-loader": "^5.3.2",
     "codecov.io": "^0.1.6",
     "coveralls": "~2.11.4",
-    "eslint": "^1.2.1",
+    "eslint": "2.7.0",
     "eventemitter2": "^0.4.14",
     "istanbul": "~0.3.5",
     "lodash": "^3.10.0",
     "map-stream": "~0.1.0",
     "mocha": "~2.3.3",
     "nock": "^2.13.0",
-    "ripple-lib": "^0.12.4"
+    "ripple-lib": "^0.17.0"
   },
   "scripts": {
     "build": "gulp",