fix typos

Release 0.2.0

We already have most of the functionality for ruby scripts debugging

  * Line breakpoints (add, delete, disable, enable)
  * Step over, step in, step out, continue, pause
  * Multiple, parallel threads
  * Call stack
  * Scope, global variables
  * Debug console
  * Watch window
  * Variables evaluate/inspect
  * Stop on entry
  * Breaking on uncaught exceptions and errors

fix rdebug-ide invocation error on windows platform

show all stack frames as RubyMine does

remove redundant imports

it works with single file ruby script