Fixed the line:

        self.Q_fe = self.Q_fe = float(sqrt(Integer(self.conductor))/2.**len(self.nu_fe)/pi**(len(self.mu_fe)/2.+len(self.nu_fe)))

by changing the divisions by 2 to division by 2. (i.e. floating point).
Integer division returns an int and so, for odd len(self.mu_fe), the
above was producing wrong powers of pi.
Add citation link at bottom of every page.
Merge branch '2013_14_a' of git://github.com/mrubinst/lmfdb into quickmerge