Changed DefaultDesktop not to select any required packages anymore

- More in changes file
- bnc#866724
Adapted .gitignore
Adapted testsuite
Added project Url
Merge pull request #40 from kobliha/desktop_selection

Fixed desktop selection
copy libzypp credentials to the target system

before starting package installation (bnc#869089)

- 3.1.8
Merge pull request #41 from yast/copy_credentials

copy libzypp credentials to the target system