Fixed a bug when we had to move or zoom the map before annotations have been drawn. We have to call the drawing from the main thread. For more info see:

http://stackoverflow.com/questions/10862914/loading-annotations-from-url-using-background-thread-pins-doesnt-show-before-m
Removed weather overlay since it needs too much resources. Kept this on my to do list for a later time.
Removed show weather button in mapview
Correction to the bugfix. It now works as it is supposed to do.
Merge pull request #5 from stephandev/master

Removed weather overlay and fixed a the bug which caused that the map had to be moved to draw annotations