Fixed Couple of instances where select-to-quote doesn't appear

[Luke F]

1. When the start or end of the text selection lands on a quote box, even if only text outside of the quote box is selected as a result
   
2. When selecting just an image (I can see this may be intentional, but honestly people quote images alone all the time e.g. in funny pic threads)

(I'm using Firefox)

 

[Mike]

Fixed both of these. The first was an FF specific behavior.