2.10 bugfixes

More bugfixes for 2.10.  These are largely accessibility related. 
-  I fixed the navigation links on the gateway page so that they change focus and move the page scroll.  (I also fixed the same issue with skip to main content in chrome). 
-  I added some sr-only text for various close glyph icons
-  I added proper form labels for achievement items 
-  I modified the gateway navigation table a bit to better support screen readers. 
-  Now that options are universal it made sense to add MathView to gateways.