Enable copy and right-click on sites that blocked them

### DANGER ###
This extension works by intercepting user events, and it CAN BREAK some webpages. In these cases, just disable it.

Usage:
- Click browser action icon to enter "copy mode" for current site

Features:
- Unlocks copy (for real)
- Remembers which site to unblock for future visits
- Minimal overhead (~300 lines of code)

This extension requires access to page content to work, source code is available here: 
https://github.com/FallenMax/chrome-extension-allow-copy