Fixing configurable logging:

1. Making "production" the default debug verbosity.
2. Falling back to default if the <meta> header is missing.
3. Changed JS version number for modified files.
4. Do not render the <meta> header if the target is "production", saving space on the page.
Merge branch 'master' of github.com:BitsDevelopmentTeam/bits-server
Adding Futures and CAres to Makefile target virtualenv.

They are not strictly needed, but Tornado recommends their usage:

* Futures is the recommended scheduler queue
* PyCares is an interface to the non-blocking DNS resolver which might be useful
Documenting DebugMode ui module.
Adding delete command to DB engine.
Adding User model to DB and auth module to server.
Implementing login/logout logic in server.
Adding utility to manage users.
Fixing bootstrap to skip bitsd.conf if not found.
Fixing log message in usermanage.py, fix userdel.
Adding logout ID to logout link for future styling.
Removing uneeded decorators.
Checking for integrity errors when adding user.
Making secure cookie max age configurable.
Adding passlib to makefile dependencies.
Updating setup.py
Adding foreign key to Users table from Message.
Adding wrong password error message to login handler.
Fixing typo in model definition.
Redirect user to next page if already authenticated.