pyBKM 0.1.3

The release 0.1.3 of pyBKM has been released. Major changes since 0.1.2 include:
- German translation
- Reopen last database
- Recent files list
- Copy, Cut and Paste using clipboard
- Delete all selected nodes instead of only one selected

This release is almost ready for 0.2 version number according to the roadmap. The only missing feature for that is a Microsoft Windows installer.