base: implemented guess_dependency
README: added qt5-qtbase-gui dependency
base: conf attribute is public
conf: exludes are default empty list
plugin_engine: removed warnnings in load_plugins
Implemented MakePlugin (fix #54)
Implemented basic PythonPlugin (fix #13)
Added PythonPlugin tests.
Implemented MakePlugin test.
command: added comparison
Renamed Command 'append_cmdlines' method to 'append'. (fix #69)
test_plugins: fixed test_find_files
guess_name method implemented (fix #8)
test_guess_name* method implemented (fix #8)
build_packages mistake