Collecting invirtualenv==1.4.0
  1 location(s) to search for versions of invirtualenv:
  * https://pypi.python.org/simple/invirtualenv/
  Getting page https://pypi.python.org/simple/invirtualenv/
  Analyzing links from page https://pypi.org/simple/invirtualenv/
    Found link https://files.pythonhosted.org/packages/b1/20/aa9b36190d28ee08faaae1cedc5f72bf1349d67ce08a0824c7f59d8378de/invirtualenv-1.3.0.tar.gz#sha256=ca78afd27c04cd90bf1eb320beec1039efcc77aa699d43bbe0cc6c41e19b0720 (from https://pypi.org/simple/invirtualenv/), version: 1.3.0
    Found link https://files.pythonhosted.org/packages/5f/4b/a18db68f4b55f8bd78687402c9295deadb43a01f292354f2c8c5b9c90365/invirtualenv-1.4.0-py3-none-any.whl#sha256=46dc5fb05d915843c224485f8668fc72af67892fb163dff4a7a897c87ad18425 (from https://pypi.org/simple/invirtualenv/), version: 1.4.0
    Found link https://files.pythonhosted.org/packages/2b/57/e9ec8ecd821dec8d34103561d831b273ee959bd71d61bc6d1a030f8da931/invirtualenv-1.4.0.tar.gz#sha256=4d41496b6c992b089c432198c259f780e589fdd1b4bcbd153791e873f0a0f95b (from https://pypi.org/simple/invirtualenv/), version: 1.4.0
  Using version 1.4.0 (newest of versions: 1.4.0)
  Downloading https://files.pythonhosted.org/packages/5f/4b/a18db68f4b55f8bd78687402c9295deadb43a01f292354f2c8c5b9c90365/invirtualenv-1.4.0-py3-none-any.whl
  Downloading from URL https://files.pythonhosted.org/packages/5f/4b/a18db68f4b55f8bd78687402c9295deadb43a01f292354f2c8c5b9c90365/invirtualenv-1.4.0-py3-none-any.whl#sha256=46dc5fb05d915843c224485f8668fc72af67892fb163dff4a7a897c87ad18425 (from https://pypi.org/simple/invirtualenv/)
  Saved /tmp/tmpb13uqx2o/invirtualenv-1.4.0-py3-none-any.whl
Skipping invirtualenv, due to already being wheel.
Cleaning up...
  Removing source in /tmp/pip-build-4ekptxd9/invirtualenv