Normalize the user guide list and steps list style

Thumbnail sizes and spacing was off, so I fixed it.  Also got rid of the large
screen only layout.
Depluralize StepsEditActivity
Continue to refine the step / step edit navigation experience
Disable menu items that aren't implemented
Fix full screen image size

Previously it was incorrectly showing a medium or thumbnail version of the
image.  Now it will show the original, full size image.
Topic view changes

* Actually use the constants defined for the tabs - More info was mixed up with
  answers in getView.
* Swap answers and more info tab so it's less jarring when a site doesn't have
  answers.
* Actually only show the subject if the guide has one.
Update main panel with the selected topic

If the device is multi-paneled, as the user drills down the topic hierarchy,
update the main panel with the selected topic information.  This replaces the
"General Information" list item.
Move ThumbnailView up to general ui.guide package
Don't jump past the introduction when viewing a guide from TopicView