specify cookiecutter branch, use shortcut for github URL

Steve Piercy

2017-06-02 813b7c636a77c0a1a182f9390cfadd0a452c5d2a

 docs/quick_tour.rst

@@ -510,7 +510,7 @@

.. code-block:: bash

    $ $VENV/bin/cookiecutter https://github.com/Pylons/pyramid-cookiecutter-starter
    $ $VENV/bin/cookiecutter gh:Pylons/pyramid-cookiecutter-starter --checkout 1.8-branch

If prompted for the first item, accept the default ``yes`` by hitting return.

@@ -866,7 +866,7 @@
.. code-block:: bash

    $ cd ~
    $ env/bin/cookiecutter https://github.com/Pylons/pyramid-cookiecutter-alchemy
    $ env/bin/cookiecutter gh:Pylons/pyramid-cookiecutter-alchemy --checkout 1.8-branch

If prompted for the first item, accept the default ``yes`` by hitting return.