Easy Checks update - Keyboard, Forms, Media

1. 
<http://www.w3.org/WAI/EO/wiki/Web_Accessibility_Preliminary_Evaluation#Keyboard_access.2C_content_order.2C_visual_focus>Keyboard 
<http://www.w3.org/WAI/EO/wiki/Web_Accessibility_Preliminary_Evaluation#Keyboard_access.2C_content_order.2C_visual_focus>access: 

    * Incorporated Andrew's comments in keyboard access, thanks Andrew!
    * Removed "labels" from keyboard section since there was no 
mention of them in the text.
2. 
<http://www.w3.org/WAI/EO/wiki/Web_Accessibility_Preliminary_Evaluation#Multimedia_.28video.2C_audio.29_alternatives>Media 

    * responded to need to explain about toggling
    * added more about what audio description is
    * incorporated request for auto-play
    * removed reference to audio contrast (too complex for easy check imo)
3. 
<http://www.w3.org/WAI/EO/wiki/Web_Accessibility_Preliminary_Evaluation#Forms.2C_form_labels.2C_and_error_messages>Forms 

    * Added "...and form labels" to title of Forms section since the 
keyboard stuff is moved, really labels and error messaging are the 
important test items.
    * Added a section on form labels
    * removed the more than 10 references, accepted most of Suzanne's 
additional simplification
    *  tweaked the order, minimized the verbiage

I removed most comments since they were addressed but left those 
about complexity in the Media section.  As always, comments are welcome.

Best,
Sharron