adding copy button to code blocks and fixing the integration bug

[choldgraf]

• Add / update documentation

This PR does two things:

• adds the sphinx copybutton to the code blocks
• fixes the bug that was causing integration tests to fail.
  • For some reason the result of loading the yaml was no longer an instance of dict but instead was an instance of CommentedMap. That was causing this line to always return True, which was creating an empty dictionary and removing any previous values in that final node. This PR checks for that type as well and it's now passing tests.

closes #122

[yuvipanda]

<3 thanks!