message: Some small updates to the readme base on my experience.
diff: @@ -20,6 +20,17 @@ in the service of the secondary goal above :)
  Getting Started
  ===============
  +This assumes you're using virtualenv, virtualenvwrapper, and Python3.5+. The
  +[hitchhiker's guide to
  +python](http://docs.python-guide.org/en/latest/dev/virtualenvs/) has a good
  +intro on both of these. The instructions after this point haven't been in
  +environments that don't aren't using virtualenv.
  +
  +```shell
  +pip3 install virtualenv
  +pip3 install virtualenvwrapper
  +```
  +
  Install Tensorflow
  ------------------
  Start by installing Tensorflow and the dependencies, optionally into a
  @@ -29,6 +40,12 @@ virtualenv if you so choose. First:
  pip3 install -r requirements.txt
  ```
  +or if you don't have a GPU:
  +
  +```
  +pip3 install -r requirements-cpu.txt
  +```
  +
  Then, you must either install CUDA 8.0 (See Tensorflow documentation) or downgrade
  to non-gpu tensorflow. To downgrade:
  