Update schemas, use schemas for validation, and switch to is-my-json-valid

package.json

@@ -18,8 +18,7 @@
     "babel-runtime": "^5.3.2",
     "bignumber.js": "^2.0.3",
     "extend": "~1.2.1",
-    "jayschema": "^0.3.1",
-    "jayschema-error-messages": "^1.0.3",
+    "is-my-json-valid": "^2.12.0",
     "lodash": "^3.1.0",
     "lru-cache": "~2.5.0",
     "ripple-lib-transactionparser": "^0.3.2",
@@ -30,8 +29,8 @@
   },
   "devDependencies": {
     "assert-diff": "^1.0.1",
-    "babel": "^5.3.3",
-    "babel-core": "^5.3.2",
+    "babel": "~5.4.7",
+    "babel-core": "~5.4.7",
     "babel-loader": "^5.0.0",
     "coveralls": "~2.10.0",
     "eslint": "^0.18.0",