'current_command' has to be stored in xconf
rebar_deps: fix Dialyzer warning
rebar_deps: 'depowner' has to be stored in xconf
rebar_deps: fix overly long lines
Fix issues introduced in #137 (4dfdd72)

* fix Dialyzer warning
* fix formatting
Merge pull request #155 from tuncer/fixes

Fixes for #137 and #142