Remove sphinx themes from requirements, remove Import error

We don't support Python 2.5 and after 2.6 parse_qsl is available in
urlparse

[ci skip]

requirements.txt

@@ -1,6 +1,5 @@
 coverage==3.6.0
 requests==1.2.2
 requests_oauthlib==0.3.2
-sphinxjp.themes.basicstrap==0.2.0
 python-coveralls==2.1.0
 nose-cov==1.6

twython/compat.py

@@ -25,10 +25,7 @@ except ImportError:
 
 if is_py2:
     from urllib import urlencode, quote_plus
-    try:
-        from urlparse import parse_qsl
-    except ImportError:
-        from cgi import parse_qsl
+    from urlparse import parse_qsl
 
     str = unicode
     basestring = basestring