STYLE: In reloadScriptedModule - Use 'with' statement to open file

See http://freepythontips.wordpress.com/2014/01/15/the-open-function-explained/

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22840 3bd1e089-480b-0410-8dfb-8563597acbee