Adds counts for likes and comments to the reader action buttons.

Fixes a minor issue positioning the action buttons.
Removes padding on images and tweaks alignment a bit.
Adjusts button alignment and fixes bug with text bubble dispaly.

Fixes an issue where the backing layer would be visible when the count was zero.
Merge pull request #1704 from wordpress-mobile/issues/1028-like-comment-counts

Issues/1028 like comment counts