pull changes from master to dev on 2014-12-11

This update brings these approved pulls to the dev branch:
* User-visible:
    * #1447: don't allow trip attacks which can't succeed due to konstant
    * #1465: let stinger dice contribute a minimum of `$die->min`, not 1
* Not user-visible:
    * #1460: make player_auth field larger so we won't hit a limit there any time soon

Database updates:
```
01459_player_auth.sql
```

Once this pull is merged, i will load the changes on dev.buttonweavers.com as part of #217.