Adds ability to raise (custom) errors - for people who need extra con…

…trol over the errors returned by thier API. defaults to standard Boom errors if an errorFunc is not defined. 100% backward compatible. (no change required) implemented by @jync in #183

package.json

@@ -1,6 +1,6 @@
 {
   "name": "hapi-auth-jwt2",
-  "version": "7.0.1",
+  "version": "7.1.0",
   "description": "Hapi.js Authentication Plugin/Scheme using JSON Web Tokens (JWT)",
   "main": "lib/index.js",
   "repository": {