Issue #243: Change Log leve to INFO if (conservancy/kallithea)

[Thomas Güttler]

New issue 243: Change Log leve to INFO if
https://bitbucket.org/conservancy/kallithea/issues/243/change-log-leve-to-info-if

Thomas Güttler:

While debugging issue #242 I discovered that it would be useful to raise the log level if this message from DEBUG to INFO:


```
#!log

2016-08-17 23:47:58.841 DEBUG [kallithea.lib.auth] Permission to repo: repowhichfailed denied for user: readonly @ PermissionMiddleware

```

What do you think?