Trun off linkcheck, it's too noisy. Fixes #652
diff --git a/tox.ini b/tox.ini
index 4248db3..24f1ea5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -22,7 +22,6 @@
     sphinx-build -W -b html -d {envtmpdir}/doctrees docs docs/_build/html
     sphinx-build -W -b latex -d {envtmpdir}/doctrees docs docs/_build/latex
     sphinx-build -W -b doctest -d {envtmpdir}/doctrees docs docs/_build/html
-    sphinx-build -W -b linkcheck docs docs/_build/html
     sphinx-build -W -b spelling docs docs/_build/html
 
 # Temporarily disable coverage on pypy because of performance problems with