Issue #45: Add support for maven dependency graph provided by AProx
Issue #45: Fix bad references in the urlmap result returned by AProx depgrapher
Issue #45: Move import of AProx APIs in the _listDependencyGraph method to avoid missing requests package error when not needed
Issue #45: Add support for maven dependency graph provided by AProx
- change the used preset to sob-build
- add test of the _lietDependencyGraph method
- handle all classifiers when requested
Issue #45: Add support for maven dependency graph provided by AProx
- switch from requests to httplib/urllib
- add test for creation and deletion of a workspace
- add test for check dependency graph creation without requesting all classifiers
- enhance checking of listing results