assignment operators test
start_pos is usually not needed to search in modules, but if we generalize that, things get a lot slower - tests still pass - but the slowness is probably due to some weird recursion catching that now happens and that Jedi runs into, e.g. check ./run.py std 27 --debug
remove position argument of follow_path
restructure NameFinder.filter_name a little bit
delete unnecessary checks from filter
enable assignment operators and add substraction support for numbers