added position-size schematic for nodes
gitignore
fixed the bugs in the positioning system;
added schematics;
added listen on children events from the group;
Added hit types for nodes and groups;

Added simulate event will take a custom target if needed; This is required by the group to bubble the event;
Consider using futures instead of events;
added the ME_BUT_NOT_CHILDREN hit type;
Merge branch 'reorganize-position-size' into v02