Use the canonical (and HTTPS) URLs for devcenter and pip

To save the 301s.

Readme.md

 # Heroku Buildpack: Python
 ![buildpack_python](https://cloud.githubusercontent.com/assets/51578/13116296/5f4058f0-d569-11e5-8129-bffd7be091e6.jpg)
 
-This is the official [Heroku buildpack](http://devcenter.heroku.com/articles/buildpacks) for Python apps, powered by [pip](http://www.pip-installer.org/) and other excellent software.
+This is the official [Heroku buildpack](https://devcenter.heroku.com/articles/buildpacks) for Python apps, powered by [pip](https://pip.pypa.io/) and other excellent software.
 
 Recommended web frameworks include **Django** and **Flask**. The recommended webserver is **Gunicorn**. There are no restrictions around what software can be used (as long as it's pip-installable). Web processes must bind to `$PORT`, and only the HTTP protocol is permitted for incoming connections.
 

bin/detect

@@ -4,7 +4,7 @@
 # [**Python Buildpack**](https://github.com/heroku/heroku-buildpack-python)
 # detector.
 #
-# A [buildpack](http://devcenter.heroku.com/articles/buildpacks) is an
+# A [buildpack](https://devcenter.heroku.com/articles/buildpacks) is an
 # adapter between a Python application and Heroku's runtime.
 
 # ## Usage

bin/steps/collectstatic

@@ -47,7 +47,7 @@ if [ ! "$DISABLE_COLLECTSTATIC" ] && [ -f "$MANAGE_FILE" ] && [ "$DJANGO_INSTALL
         echo
         echo "          $ heroku config:set DISABLE_COLLECTSTATIC=1"
         echo
-        echo "       http://devcenter.heroku.com/articles/django-assets"
+        echo "       https://devcenter.heroku.com/articles/django-assets"
 
         # Additionally, dump out the environment, if debug mode is on.
         if [ "$DEBUG_COLLECTSTATIC" ]; then

bin/steps/cryptography

@@ -4,7 +4,7 @@
 # [**Python Buildpack**](https://github.com/heroku/heroku-buildpack-python)
 # compiler.
 #
-# A [buildpack](http://devcenter.heroku.com/articles/buildpacks) is an
+# A [buildpack](https://devcenter.heroku.com/articles/buildpacks) is an
 # adapter between a Python application and Heroku's runtime.
 #
 # This script is invoked by [`bin/compile`](/).

bin/steps/gdal

@@ -4,7 +4,7 @@
 # [**Python Buildpack**](https://github.com/heroku/heroku-buildpack-python)
 # compiler.
 #
-# A [buildpack](http://devcenter.heroku.com/articles/buildpacks) is an
+# A [buildpack](https://devcenter.heroku.com/articles/buildpacks) is an
 # adapter between a Python application and Heroku's runtime.
 #
 # This script is invoked by [`bin/compile`](/).

bin/steps/pylibmc

@@ -4,7 +4,7 @@
 # [**Python Buildpack**](https://github.com/heroku/heroku-buildpack-python)
 # compiler.
 #
-# A [buildpack](http://devcenter.heroku.com/articles/buildpacks) is an
+# A [buildpack](https://devcenter.heroku.com/articles/buildpacks) is an
 # adapter between a Python application and Heroku's runtime.
 #
 # This script is invoked by [`bin/compile`](/).