Disable Pythran integration testing in travis as it currently fails to compile...

Disable Pythran integration testing in travis as it currently fails to compile with the latest release version of Pythran (changes pending on their side).

.travis.yml

@@ -45,7 +45,7 @@ before_script: ccache -s
 script:
   - PYTHON_DBG="python$( python -c 'import sys; print("%d.%d" % sys.version_info[:2])' )-dbg"
   - if $PYTHON_DBG -V >&2; then CFLAGS="-O0 -ggdb" $PYTHON_DBG runtests.py -vv Debugger --backends=$BACKEND; fi
-  - if [ "$BACKEND" = "cpp" ]; then pip install pythran; fi
+  - if [ false && "$BACKEND" = "cpp" ]; then pip install pythran; fi  # disabled: needs Pythran > 0.8.1
   - CFLAGS="-O2 -ggdb -Wall -Wextra $(python -c 'import sys; print("-fno-strict-aliasing" if sys.version_info[0] == 2 else "")')" python setup.py build_ext -i
   - CFLAGS="-O0 -ggdb -Wall -Wextra" python runtests.py -vv -x Debugger --backends=$BACKEND -j4