Version 0.2

- Fix #3 
- Make layman be quiet when there some problem with repositories (not tracer's problem)
- Use standard main function
- **Add possibility to specify packages that only should be traced (via arguments or pipe)**
- Fix locating package database file on Fedora (There was different order of listed files on F19 and F20)
- Separate YUM and DNF package managers
- Set DNF as default fedora package manager
- **Add argument parser**
- Add class for representing package
- Add Tracer class
- **Add tracer plugin for DNF**