rietveld does not like code reviews with subjects longer than 100 characters, so trim the line pulled out of the description to avoid the limit.

R=r
http://go/go-review/1016027

lib/codereview/codereview.py

@@ -145,6 +145,8 @@ class CL(object):
 
 	def Subject(self): 
 		s = line1(self.desc)
+		if len(s) > 60:
+			s = s[0:55] + "..."
 		if self.name != "new":
 			s = "code review %s: %s" % (self.name, s)
 		return s