Disable warnings as errors when building docs

Temorary solution to get docs building with Sphinx 1.3

.travis.yml

@@ -63,7 +63,7 @@ script:
       gdb -return-child-result -batch -ex r -ex bt --args python ../matplotlib/tests.py -sv --processes=8 --process-timeout=300 $TEST_ARGS
     else
       cd doc
-      python make.py html --small --warningsaserrors
+      python make.py html --small
       # We don't build the LaTeX docs here, so linkchecker will complain
       touch build/html/Matplotlib.pdf
       linkchecker build/html/index.html