Fix NPE caused by mismatched view ids
Fix OutOfMemory errors in Guide View and Edit

Views sometimes will hold onto references to bitmaps which causes a slow memory
leak.  This was causing the app to crash after paging through 20 or so steps
(depending on the device).  Releasing the bitmaps and setting the imageviews to
null frees the bitmap from native memory and allows the GC to do its thing.
Add stack icon to represent teardowns menu item
Free up imageview's and cancel existing requests before making a new one
Clean up delete step
Only initialize guide grid if it hasn't been initialized yet
Add german playstore text and move app_store_en to PlayStoreResources