Ability to retrieve selection from all environments.

[pgmichael]

We currently retrieve the selected text from the selection context or the window.getSelection method. Unfortunately, this does not seem to works in certain environment:

• PDFs
• Google Docs
• Text inputs
• iFrames

[Su-Well]

If you change line 57 in background.js from selectionContents.textContent; to selectionContents.textContent || window.getSelection().toString(); it will work for text input without affecting existing functionality. It's not very elegant code, so I'll just leave it as a comment here and let you decide how/if you want to add it.

For pdf's it looks like this might work. Not sure about Google docs though.