v0.3.2

Bugfixes:
- error handling: don't crash if opening a file fails
  commit 8d318842836135a82d5e9b1e3588a9fa2215cdb7
- use rifle python binding if installed
  commit da34c62ea496862d1084f49d15b55cc39af08db7
- don't crash when stopping file viewer with ctrl+c
  commit 8fdad1c144fc7d2de184b11092ee664dd6a0ac2a