Save config after updating node name
Emit ConfigSaved event
Listen for ConfigSaved event in the UI (fixes #244)
Add session support (fixes #611)
use modification time for version timestamp; change version format to filename~yyyymmdd-hhmmss
Merge remote-tracking branch 'origin/pr/646'

* origin/pr/646:
  Add session support (fixes #611)
Cleanup imports in previous
Merge remote-tracking branch 'origin/pr/647'

* origin/pr/647:
  Listen for ConfigSaved event in the UI (fixes #244)
  Emit ConfigSaved event
  Save config after updating node name
Update goleveldb (fixes #644, closes #648)