[debugger] implemented setBreakpoint, etc
[debugger] implemented setBreakpoint, etc

Lift prototype methods not only as accessors, but as properties too.
this.print() supports javascript objects inspection
this.error() implemented, don't throw error at callbacks and commands
Fixed list() invokation, when script is not on a breakpoint
Removed obsolete process.nextTick from `step` commands

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node