Install skimage so we do not have to fool with PYTHONPATH

.travis.yml

@@ -26,6 +26,7 @@ before_install:
 
 install:
     - python setup.py build_ext --inplace
+    - python setup.py install
 
 script:
     - tools/travis_test.sh

tools/travis_test.sh

@@ -49,7 +49,6 @@ if [[ $TRAVIS_PYTHON_VERSION == 2.* ]]; then
 fi
 
 tools/header.py "Run doc examples"
-PYTHONPATH="..":$PYTHONPATH
 for f in doc/examples/*.py; do
     python "$f";
     if [ $? -ne 0 ]; then