TST/CI: add scikits.timeseries wheel back

Author: cpcloud

ci/requirements-2.7.txt

@@ -12,7 +12,7 @@ xlrd==0.9.2
 patsy==0.1.0
 html5lib==1.0b2
 lxml==3.2.1
-http://downloads.sourceforge.net/project/pytseries/scikits.timeseries/0.91.3/scikits.timeseries-0.91.3.tar.gz?r=
+scikits.timeseries==0.91.3
 MySQL-python==1.2.4
 scipy==0.10.0
 beautifulsoup4==4.2.1