blareleasesbrowser.py: PEP8-compliance changes

Signed-off-by: Niklas Koep <niklas.koep@gmail.com>
blaeventbrowser.py: PEP8-compliance changes

Signed-off-by: Niklas Koep <niklas.koep@gmail.com>
Handle key events in event and release browsers...

(closes #6)

Signed-off-by: Niklas Koep <niklas.koep@gmail.com>