Re-disable third-party integration testing in Py2.6 entirely since most...

Re-disable third-party integration testing in Py2.6 entirely since most packages aren't compatible anymore (and I don't want to dig up the versions that are).

.travis.yml

@@ -151,7 +151,7 @@ before_install:
 
 install:
   - python -c 'import sys; print("Python %s" % (sys.version,))'
-  - if [ -z "${TRAVIS_PYTHON_VERSION##2.*}" ]; then pip install -r test-requirements-27.txt ; fi
+  - if [ -z "${TRAVIS_PYTHON_VERSION##2.7}" ]; then pip install -r test-requirements-27.txt ; fi
   - if [ -n "${TRAVIS_PYTHON_VERSION##*-dev}" -a -n "${TRAVIS_PYTHON_VERSION##2.*}" ]; then pip install -r test-requirements.txt $( [ -z "${TRAVIS_PYTHON_VERSION##pypy*}" -o -z "${TRAVIS_PYTHON_VERSION##3.[478]*}" ] || echo " -r test-requirements-cpython.txt" ) ; fi
 #  - CFLAGS="-O2 -ggdb -Wall -Wextra $(python -c 'import sys; print("-fno-strict-aliasing" if sys.version_info[0] == 2 else "")')" python setup.py build