Stop spawning new entities off-screen in WM

Closes #97

Author: Joncom

lib/weltmeister/edit-entities.js

@@ -328,6 +328,7 @@ wm.EditEntities = ig.Class.extend({
 		this.hideMenu();
 		var newEntity = this.spawnEntity( ev.target.id, 0, 0, {} );
 		this.selectEntity( newEntity );
+		this.selector.offset.x = this.selector.offset.y = 0;
 		this.moveSelectedEntity( this.selector.pos.x, this.selector.pos.y );
 		ig.editor.setModified();
 
@@ -694,4 +695,4 @@ wm.EditEntities = ig.Class.extend({
 	}
 });
 
-});
+});