fixes #17535, warn of cross-domain failure when loading css via dojox/html/styles

Squashed commit of the following:

commit 78c74e046bbfe52383114dcffdea7cc9931e63c9
Author: Wouter Hager <wshager@gmail.com>
Date:   Wed Apr 30 00:50:36 2014 +0200

    added warning

commit f2dca7b091f70ef3819c312ade1dd0c752e21372
Author: whager <whager@benjamins.nl>
Date:   Sun Apr 27 11:19:42 2014 +0200

    fixes cssRules property read fail due to same-origin policy
refs #17632, minor test cleanup for dojox/form/Uploader
fix file permissions, fixes #17919 in dojox, except for submodules
update dojox to the latest dojox/app commit, fixes #17919 file permissions.
fixes #15495, support custom validation messages in dojox/validate/check
Fix https://bugs.dojotoolkit.org/ticket/15561 :
change regexp used to parse SVG paths to support numbers with exponents e.g. -6e-9.
update calendar & dgauges submodules
Add position: "center" option on axis to allow centered axis.
Enhancement request: https://bugs.dojotoolkit.org/ticket/17724.
fixes #17810 touch/pointer events feature detection.
Fix dgauges submodule commit reference
Updating metadata for 1.10.0-beta1
Updating source version to 1.10.0-pre
Fixes #17944. ComboBox: remove the hack for opting out from dijit/BackgroundIframe. This avoids all situations where dijit/popup was throwing an error when opening or closing the combo. Also added a DOH test case for it.
Refs #17683. Fix ios7 CSS of ComboBox which was not consistent wrt. the changes already made in the less file of ComboBox for #17821
Refs #17944. ComboBox: added style for the iframe (similar to dijit's), now needed since the removal of the hack for opting out dijit/popup's iframe
Refs #17998. Fix in TextArea test to cope with changing dimensions after browser updates; now allows a tolerance threshold
fix invalid tests, refs #17998
fixes #17999: buildRendering fails in rtl
Fixes #18000. Fix broken ComboBox in RTL - ensure the isLeftToRight() is defined on the internal instance of Scrollable.
Fixed trac ticket number in comment