Fixed pytest not working with python 2.7. So turning travis tests back on for...

Fixed pytest not working with python 2.7.  So turning travis tests back on for that version of python.

.travis.yml

@@ -91,7 +91,7 @@ matrix:
 
     ###################
     - language: python
-      python: 3.5
+      python: 2.7
       env:
         - VARIANT=python-api
       script:
@@ -99,7 +99,7 @@ matrix:
 
     ###################
     - language: python
-      python: 3.7
+      python: 3.5
       env:
         - VARIANT=python-api
       script:

setup.py

@@ -230,7 +230,8 @@ setup(
     ext_modules=[CMakeExtension('dlib','tools/python')],
     cmdclass=dict(build_ext=CMakeBuild, test=PyTest),
     zip_safe=False,
-    tests_require=['pytest==3.8'],
+    # We need an older more-itertools version because v6 broke pytest (for everyone, not just dlib)
+    tests_require=['pytest==3.8', 'more-itertools<6.0.0'],
     #install_requires=['cmake'], # removed because the pip cmake package is busted, maybe someday it will be usable.
     packages=['dlib'],
     keywords=['dlib', 'Computer Vision', 'Machine Learning'],