_s: rework nav JS file a bit
_s: rework nav JS file a bit

 * Remove top-level browser width variable, only needed in one internal function
 * Add timeout so that the resize action doesn't constantly trigger, instead give it a short delay to anticipate the user finishing the window size change
 * Better comments
 * Incorporate mattwiebe fix for calling jQuery objects incorrectly, see http://core.trac.wordpress.org/ticket/20131 


git-svn-id: 7df150f706e782e7e489b4d8917710a3f79d4070@9026 d957f892-c61d-0410-b221-f235e6eecf30

madeso-uk/vcsassist,SparkartGroupInc/nadando,carl-alberto/business-portfolio,andbaz/launchbaz,vaishaliagola27/_s,jchck/jchck_,madeso-uk/vcsassist,solidusjs/wp-solidus,andbaz/launchbaz,vaishaliagola27/_s,vaishaliagola27/_s,jchck/jchck_,carl-alberto/business-portfolio