Merge pull request #1 from fabian-gentner/master

Pull changes from Fabian
LogReader._close_file() now sets logfile_id to None.
Merge pull request #2 from fabian-gentner/master

Pull changes from Fabian
fix pyflakes warnings
Merge https://github.com/hjacobs/logfire
Bugfix: *LogAggregator needs file_names after all.