Merge pull request #1 from stephandev/master

Fixed a bug when the app crashed when using the searchbar in mapview
NSTimer for VATSIM data and Zulu Clock

-Zulu clock now shows current time, hh:mm:ss, live updating.
-New aircraft icon, again. Bigger and nicer.
-NSTimer for VATSIM data works and downloads new data every 3 minutes.

KNOWN BUGS:
When downloading new data or hiding/showing planes, the new planes
become duplicate pins.
Merge pull request #7 from mshamash/master

NSTimer for VATSIM data and Zulu Clock