mini_readline 0.6.4

A gem, for console command entry with line edit and history, inspired by the standard readline gem. Its creation was motivated by the bugs and eternal pull requests of that same gem. Further frustration was caused by the fact the the system readline gem seems to use a special load path that bypasses the normal gem protocols. Also included are four sample auto-complete agents and the irbm utility, which is irb + mini_readline and not an Intermediate Range Ballistic Missile.