Update travis and appveyor builds to eigen 3.3.0 (#491)

diff --git a/.travis.yml b/.travis.yml
index 2fc12c1..a56120b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -97,9 +97,9 @@
   else
     pip install numpy scipy pytest
 
-    wget -q -O eigen.tar.gz https://bitbucket.org/eigen/eigen/get/3.2.9.tar.gz
+    wget -q -O eigen.tar.gz https://bitbucket.org/eigen/eigen/get/3.3.0.tar.gz
     tar xzf eigen.tar.gz
-    export CMAKE_EXTRA_ARGS="${CMAKE_EXTRA_ARGS} -DCMAKE_INCLUDE_PATH=$PWD/eigen-eigen-dc6cfdf9bcec"
+    export CMAKE_EXTRA_ARGS="${CMAKE_EXTRA_ARGS} -DCMAKE_INCLUDE_PATH=$PWD/eigen-eigen-26667be4f70b"
   fi
 script:
 - $SCRIPT_RUN_PREFIX cmake ${CMAKE_EXTRA_ARGS}