Remove lxml dependency
Remove lxml dependency

pysolr 3.3.2+ no longer requires lxml, which saves a significant install
dependency

Stupeflix/django-haystack,vitalyvolkov/django-haystack,barseghyanartur/django-haystack,comandrei/django-haystack,django-searchstack/django-searchstack,elishowk/django-haystack,vitalyvolkov/django-haystack,eventials/django-haystack,eventials/django-haystack,Stupeflix/django-haystack,barseghyanartur/django-haystack,antonyr/django-haystack,comandrei/django-haystack,jannon/django-haystack,sgaist/django-haystack,streeter/django-haystack,vitalyvolkov/django-haystack,ruimashita/django-haystack,streeter/django-haystack,celerityweb/django-haystack,kuanyui/django-haystack,cyanut/django-haystack,cyanut/django-haystack,django-searchstack/django-searchstack,fisle/django-haystack,django-searchstack/django-searchstack,antonyr/django-haystack,elishowk/django-haystack,eventials/django-haystack,kuanyui/django-haystack,antonyr/django-haystack,jannon/django-haystack,ruimashita/django-haystack,barseghyanartur/django-haystack,sgaist/django-haystack,comandrei/django-haystack,kuanyui/django-haystack,elishowk/django-haystack,celerityweb/django-haystack,ruimashita/django-haystack,cyanut/django-haystack,fisle/django-haystack,streeter/django-haystack,sgaist/django-haystack,Stupeflix/django-haystack,jannon/django-haystack,fisle/django-haystack,celerityweb/django-haystack