Added some additional files for the git training

- cheatcheats (URLs and VI commands)
- tips some Git specialities
First draft of practices for the git-workshop
Added some additional files for the git training

- cheatcheats (URLs and VI commands)
- tips some Git specialities

First draft of practices for the git-workshop
More practices
Added some hints for bash
Merge branch 'test-branch'

Conflicts:
	git-cheatsheets.txt
	git-practices.txt
Some nice git commands