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

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

Type of Changes

	Type
✓	🐛 Bug fix
✓	✨ New feature
✓	🔨 Refactoring
✓	📜 Docs

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