Download logs in smaller pieces
Register real builds done by packagers

This will provide more context for users. Fedmsg only now, no polling.
Compute Koji load per arch

Exhaustion of one arch of builders is something I'd like to avoid. Also skips
ppc builders, which are reported by Koji but useless for us.
Refactoring: move common koschei-specific parts to new backend module
Attach dependency changes to real builds
Config overridable by env var
Basic test infrastructure
Few tests for watcher
Run tests with nose from setup.py
Remove redundant close() call on session
Use ON DELETE CASCADE for foreign keys
Tests for registering real builds
Get rid of scheduled state
Test for scheduler dependency query
Test for time priority
Add table for buildArch tasks
admin setprio takes multiple packages