Name all loggers.

Instead of using the root logger, give all used loggers names related to the package and their location.
This allows users to work with flask-admin logs as they wish (picking them out/ suppressing them), as well as being more clear where the logs (and errors) are originating.

Will change log output from:

    2013-08-15 22:57:47,607 - root - ERROR - Failed to create model

to:

    2013-08-15 22:57:47,607 - flask-admin.sqla - ERROR - Failed to create model