Support for nomodule/module

@rishabjasrotia thanks for the MR! I tested this out locally and have the following feedback:

1. I added a new JS file to a library with the new options selected, but no changes were seen when viewing the actual JS file. I had to add the following to library_manager_build_libraries() in library_manager.module:

diff --git a/library_manager.module b/library_manager.module
index ed6fd12..a692cec 100644
--- a/library_manager.module
+++ b/library_manager.module
@@ -117,6 +117,18 @@ function library_manager_build_libraries() {
         // Set header.
         $library_info['header'] = isset($file['header']) && !empty($file['header']) ? TRUE : FALSE;
 
+        // Add custom attributes if they exist.
+        if (isset($file['attributes']) && is_array($file['attributes'])) {
+          foreach ($file['attributes'] as $attribute_name => $attribute_value) {
+            $options['attributes'][$attribute_name] = $attribute_value;
+          }
+        }
+
+        // Set the nomodule attribute to TRUE if it is set.
+        if (!empty($options['attributes']['nomodule'])) {
+          $options['attributes']['nomodule'] = TRUE;
+        }
+
         if ($file['external']) {
           $options['type'] = 'external';
           $library_info['js'][$file['url']] = $options;

After adding the above I get the new attributes displaying correctly in the rendered output.

2. There should be a hook_update to add these new params to all existing library definitions.

New patch attached that addresses both of these points.

This has been merged with the 2.0.x branch and will be included in next release. Thanks for your work on this @rishabjasrotia!