Add profiling capabilities to GBasis

[msricher]

Add profiling capabilities to GBasis. By running py.test [FILES] --profile or py.test [FILES] --profile-svg, the test that is ran will be profiled and profile information (.prof) and optionally a heat map in .svg format will be generated in prof/.

pip install .[test] will now pull in the required libraries for this to work.

Checklist

• [x] Write a good description of what the PR does.
• [x] Add tests for each unit of code added (e.g. function, class)
• [x] Update documentation
• [x] Squash commits that can be grouped together
• [x] Rebase onto master

Type of Changes

	Type
✓	:bug: Bug fix
✓	:sparkles: New feature
✓	:hammer: Refactoring
✓	:scroll: Docs

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