Labels

Time to explain the labels properly ;-)

This needs review and comments - half the labels is unclear and I bet half of those can and should be removed.

Also, I didn't add all the "v7.x" and "7.0-current" labels yet. What do they mean?

@karlitschek @MorrisJobke 
Maybe having just three steps would be enough:
1. No label: means not started
2. Developing: development in progress / work has started (even when designing this tag could be set)
3. Reviewing: to review / review in progress (meaning dev is done)