It was just some case sensitivity and wrong values....
You had:
config.extraPlugins = 'cms_source,bootstrap-MediaEmbed';
it should be:
config.extraPlugins = 'cms_source,bootstrapMediaEmbed';
Then in the toolbar you had:
array( 'Image','bootstrapMediaEmbed'
it should be:
array( 'Image','BootstrapMediaEmbed'
Fixing those issues appears to have made it work properly on your test page.