Fixed: 'with' command took all descendend 'when' element instead of just the direct children.
Commands 'show' and 'hide' now take variables in their attributes.
Enforcing default value to be string in out.tools.getParsedAttribute() and changed out.tools.replaceVariables() to issue a console output when its input is not of type string.
Added test game for show & hide commands.
Merge branch 'develop' of https://github.com/jsteinbeck/WebStory-Engine into develop