added urllib compatibility now uses urllib2 for python2, and urllib for python3
added urllib compatibility
now uses urllib2 for python2, and urllib for python3

Signed-off-by: Arvind Chembarpu <2dd2b8beb42a3b9b22bb2cb02fd49ba1b9d5fdf2@gmail.com>

AyabongaQwabi/speech_recognition,Python-Devs-Brasil/speech_recognition,ListFranz/speech_recognition,Zenohm/speech_recognition,krypten/speech_recognition,arvindch/speech_recognition,jjsg/speech_recognition,adrianzhang/speech_recognition,AyabongaQwabi/speech_recognition,Zenohm/speech_recognition,ListFranz/speech_recognition,arvindch/speech_recognition,Uberi/speech_recognition,Uberi/speech_recognition,M4573R/speech_recognition,krypten/speech_recognition,M4573R/speech_recognition,adrianzhang/speech_recognition,Python-Devs-Brasil/speech_recognition,jjsg/speech_recognition