better name prefix for the entire library

`kb_` should be changed to something else: the whole project should have a proper name, 1) to avoid name collisions, when andother kibu project will be created, 2) to avoid later renaming, if project's ownership passed to someone else, don't make the mistake like NextStep did with `NS`. _Possible alternatives: HardwarePrototyping (`hp_`), HackathonTools (`ht_`), QuickPrototyper (`qp_`), etc._
