Commits on Sep 12, 2016

1. Rewrite tile_map loading to be more reliable …

   This changes how the tile_map plugin handles making network requires for tiles.
   It will now:
   - Use thread conditions to prompt loading rather than spinning
   - Prioritize loading tiles in the visible area
   - Retry a failed network request up to 5 times
   - Not discard tile requests if there are more than 100 in the queue
   
   This changes should significantly reduce (if not completely eliminate) the
   number of tiles that fail to load and hopefully make tiles within the visible
   area appear faster when there are many in the queue.
   
   Fixes swri-robotics#342 and swri-robotics#421.

   

   pjreed committed Sep 12, 2016
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