fix #1458 aria.utils.Dom.calculatePosition extra pixels in IE 7
fix #1458 aria.utils.Dom.calculatePosition extra pixels in IE 7

This commit improves the detection of the extra pixels returned by
getBoundingClientRect in IE 7.

fcapa/aria,ariatemplates/ariatemplates,simonarbuckle/ariatemplates,fbasso/ariatemplates,benouat/ariatemplates,simonarbuckle/ariatemplates,ariatemplates/ariatemplates,divdavem/ariatemplates,vcarle/ariatemplates,fcapa/aria,vcarle/ariatemplates,fbasso/ariatemplates,simonarbuckle/ariatemplates,ymeine/ariatemplates,fbasso/ariatemplates,vcarle/ariatemplates,ymeine/ariatemplates,divdavem/ariatemplates,benouat/ariatemplates,mlaval/ariatemplates,ariatemplates/ariatemplates,mlaval/ariatemplates,divdavem/ariatemplates,fcapa/aria,mlaval/ariatemplates,ymeine/ariatemplates,benouat/ariatemplates