Bump version to 1.2.1

bower.json

@@ -1,6 +1,6 @@
 {
   "name": "imgix-core-js",
-  "version": "1.2.0",
+  "version": "1.2.1",
   "homepage": "https://github.com/imgix/imgix-core-js",
   "authors": [
     "Kelly Sutton <michael.k.sutton@gmail.com>",

dist/imgix-core-js.js

@@ -14,9 +14,10 @@
   var Base64 = _jsBase64.Base64 || _jsBase64;
   var crc = _crc;
 
-  var VERSION = '1.2.0';
+  var VERSION = '1.2.1';
   var SHARD_STRATEGY_CRC = 'crc';
   var SHARD_STRATEGY_CYCLE = 'cycle';
+  var DOMAIN_REGEX = /^(?:[a-z\d\-_]{1,62}\.){0,125}(?:[a-z\d](?:\-(?=\-*[a-z\d])|[a-z]|\d){0,62}\.)[a-z\d]{1,63}$/i;
   var DEFAULTS = {
     host: null,
     domains: [],
@@ -62,6 +63,15 @@
           this.settings.domains[0] = this.settings.host;
       }
 
+      this.settings.domains.forEach(function(domain) {
+        if (DOMAIN_REGEX.exec(domain) == null) {
+          throw new Error(
+            'Domains must be passed in as fully-qualified ' + 
+            'domain names and should not include a protocol or any path ' + 
+            'element, i.e. "example.imgix.net".');
+        }
+      });
+
       if (this.settings.includeLibraryParam) {
         this.settings.libraryParam = "js-" + VERSION;
       }