Add example for morlet in scipy.signal
Add example for morlet in scipy.signal

ilayn/scipy,anntzer/scipy,WarrenWeckesser/scipy,mdhaber/scipy,anntzer/scipy,mdhaber/scipy,ilayn/scipy,Stefan-Endres/scipy,ilayn/scipy,Stefan-Endres/scipy,mdhaber/scipy,WarrenWeckesser/scipy,anntzer/scipy,ilayn/scipy,andyfaff/scipy,mdhaber/scipy,endolith/scipy,endolith/scipy,rgommers/scipy,scipy/scipy,mdhaber/scipy,andyfaff/scipy,scipy/scipy,Stefan-Endres/scipy,andyfaff/scipy,rgommers/scipy,andyfaff/scipy,ilayn/scipy,rgommers/scipy,WarrenWeckesser/scipy,ilayn/scipy,mdhaber/scipy,WarrenWeckesser/scipy,scipy/scipy,andyfaff/scipy,scipy/scipy,Stefan-Endres/scipy,WarrenWeckesser/scipy,endolith/scipy,rgommers/scipy,rgommers/scipy,endolith/scipy,Stefan-Endres/scipy,andyfaff/scipy,anntzer/scipy,anntzer/scipy,scipy/scipy,endolith/scipy,anntzer/scipy,WarrenWeckesser/scipy,scipy/scipy,Stefan-Endres/scipy,endolith/scipy