Add a global stop method

Fixes #1308

README.md

@@ -360,6 +360,9 @@ Mute or unmute all sounds.
 Get/set the global volume for all sounds, relative to their own volume.
 * **volume**: `Number` `optional` Volume from `0.0` to `1.0`.
 
+#### stop()
+Stop all sounds and reset their seek position to the beginning.
+
 #### codecs(ext)
 Check supported audio codecs. Returns `true` if the codec is supported in the current browser.
 * **ext**: `String` File extension. One of: "mp3", "mpeg", "opus", "ogg", "oga", "wav", "aac", "caf", m4a", "mp4", "weba", "webm", "dolby", "flac".

src/howler.core.js

@@ -150,6 +150,20 @@
       return self;
     },
 
+    /**
+     * Handle stopping all sounds globally.
+     */
+    stop: function() {
+      var self = this || Howler;
+
+      // Loop through all Howls and stop them.
+      for (var i=0; i<self._howls.length; i++) {
+        self._howls[i].stop();
+      }
+
+      return self;
+    },
+
     /**
      * Unload and destroy all currently loaded Howl objects.
      * @return {Howler}