Updates push/pop examples with put/get in README.
Updates the tests with put/get.
Updates the __main__ part with put/get
Update formatting in README.txt
Merge branch 'get_put_terminology' into develop

* get_put_terminology:
  Update formatting in README.txt
  Updates the __main__ part with put/get
  Updates the tests with put/get.
  Updates push/pop examples with put/get in README.