Add dependency_list test skeleton
Add todo.rst
Remove roadmap from spec

It will be kept in todo.rst.
Fix dependency graph for min_test_project
Remove package_build_order from app.init()
Improve pkgbuild.dependency_list()

This function was having problems with the regex when there was a comma in the
list of dependencies. Also, the bash output was reworked to prepend the arch
and dependency type (depends, optdepends, makedepends) before each dependency
so that it could be better captured by re.findall().
Rename test/projects to test/files
Rename min_test_project to test_project_1
Rename stage_packages to test_project_1_stage