Bugs fixed.

I've experienced issue when I put in +2 timezone, the script calculates sun elevation for -2 timezone so i changed plus to minus in time.localtime function. Also added support for Daylight saving time.

sun.py

@@ -2,8 +2,8 @@
 import ephem
 import time
 import sys
-timezone = change_tz
-date = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(int(sys.argv[1])+(timezone*60*60)))
+timezone = change_tz + time.localtime().tm_isdst
+date = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(int(sys.argv[1])-(timezone*60*60)))
 
 obs=ephem.Observer()
 obs.lat='change_latitude'