Calculate commit delta days with full days.

Make the units on par with active commit days. Previously a new project
committed to yesterday at 23:00 and today at 1:00 would have an age of 1 day
but 2 active days.

Signed-off-by: Heikki Hokkanen <hoxu@users.sf.net>

gitstats

 		return res[:limit]
 	
 	def getCommitDeltaDays(self):
-		return (self.last_commit_stamp - self.first_commit_stamp) / 86400 + 1
+		return (self.last_commit_stamp / 86400 - self.first_commit_stamp / 86400) + 1
 
 	def getDomainInfo(self, domain):
 		return self.domains[domain]