edited the dimensions of the no image place holder image

fixes SPOT-617
makes the recenter map button not appear until the map is loaded

fixes SPOT-552

since this is a timing issue for slow devices, i wasnt really able
to recreate the problem, but this should fix it. it may need to be
a little more thoroughly tested
made the recenter map button load betterly after the map has been loaded

fixes SPOT-552

used the google api addEventListener instead of a timeout. also, found a
5 second timeout for loading the map and removed it. optimized performance
by 5 seconds! yay. 99% sure it didnt break anything else.
Merge branch 'craig'