Tests: update pysolr requirement to 3.1.1

3.1.1 shipped a fix for a change in the Solr response format for the
content extraction handler

Author: acdha

tests/requirements.txt

@@ -4,6 +4,6 @@ geopy==0.95.1
 httplib2==0.8
 lxml==3.2.3
 mock
-pysolr==3.1.0
+pysolr>=3.2.0
 python-dateutil
 whoosh==2.5.4

tox.ini

@@ -15,7 +15,7 @@ downloadcache = {envtmpdir}tox-downloadcache/
 deps =
     lxml==3.2.3
     mock==1.0.1
-    pysolr==3.1.0
+    pysolr>=3.2.0
     whoosh==2.5.4
     elasticsearch==0.4.3
     httplib2==0.8