Merge branch 'master' into develop

# Conflicts:
#	dist/plyr.js
#	readme.md
#	src/js/plyr.js

readme.md

@@ -444,9 +444,9 @@ Here's a list of the methods supported:
   </tr>
   <tr>
     <td><code>source(...)</code></td>
-    <td>Array</td>
+    <td>Array or (null|undefined)</td>
     <td>
-      Set the media source.
+      Get/Set the media source.
       <br><br>
       <strong>string</strong><br>
       <code>.source("/path/to/video.mp4")</code><br>
@@ -458,6 +458,9 @@ Here's a list of the methods supported:
       <br><br>
       <strong>YouTube</strong><br>
       Currently this API method only accepts a YouTube ID when used with a YouTube player. I will add URL support soon, along with being able to swap between types (e.g. YouTube to Audio or Video and vice versa.)
+      <br><br>
+      <strong> null or undefined </strong><br>
+      Returns the current media source. Works for both native videos and embeds.
     </td>
   </tr>
   <tr>
@@ -704,3 +707,4 @@ Also these links helped created Plyr:
 
 ## Copyright and License
 [The MIT license](license.md).
+