Enable usage of python 3

.travis.yml

@@ -1,4 +1,7 @@
 dist: xenial
+language: python
+python:
+ - "3.5"
 branches:
   except:
     - gh-pages
@@ -7,9 +10,6 @@ addons:
   apt:
     packages:
     - doxygen
-cache:
-  directories:
-    - node_modules
 before_install:
 - export TZ=CST6CDT
 - npm install npm@latest -g
@@ -21,8 +21,11 @@ before_install:
 - doxygen --version
 install:
 - npm install
-- pip install --user tox
-- nohup npm run httpbin &
+# Other environments use tox for managing the virtualenv for httpbin
+# Travis already runs in a virtualenv so we run the commands directly
+# See: https://docs.travis-ci.com/user/languages/python/#using-tox-as-the-build-script
+- pip install -r requirements.txt
+- nohup python -m httpbin.core --port 64526 --host 0.0.0.0 &
 - gcc -v
 - git clone https://github.com/juj/emsdk.git
 - (cd emsdk && git checkout 369013943283939412fb2807bb0d2ded8ebd5a9e)

make-it/cpplint/README.md

@@ -1,6 +1,6 @@
 # cpplint
 
-[cpplint.py](https://github.com/google/styleguide/blob/gh-pages/cpplint/cpplint.py) is a Google tool for checking common style rules common to the
+[cpplint.py](https://github.com/cpplint/cpplint/blob/851ceb00cba6301b00167cf5c313532bc05cf1eb/cpplint.py) is a Google tool for checking common style rules common to the
 VireoSDK projects as well. It has its own copyright that is included at the
 top of cpplint.py.