rulus.js: execScript for IE9; sourceURL only in debug mode;
Merge pull request #21 from andrejev/master

rulus.js: execScript for IE9; sourceURL only in debug mode;
rulus.accordion open-sourced
rulus.accordion submodules open-sourced
Merge remote-tracking branch 'upstream/master'
Fix: isOpen-argument handling for rulus.accordion.section