mtlynch / GreenPiThumb_Frontend / 32

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Adding unit test support for HTTP handler

Switching from the klein web framework to Flask because Flask directly supports
unit testing, whereas klein does not.

Adding unit test coverage for the HTTP request serving logic.

Note: The unit tests use mock.Mock(spec_set=...) here because they're mocking out
dependencies in the GreenPiThumb backend and we've had bugs from the backend
library and the frontend library going out of sync. Setting an explicit mock
spec_set means that our tests will fail if we try to mock out a method that doesn't
really exist on the interface we're mocking.

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