Laboratory

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* Added: Add `randomize=True` argument to `Experiment.conduct` (thanks to Nick DiRienzo)

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* Added: Sphinx documentation & docstrings
* Added: Conditionally disable Experiments with `enabled()`
* Added: Randomised execution order of experiments.
* Breaking: Experiment control & candidate blocks are now set up in a different way without the use of context processors.
This new API should allow some extra functionality in the future, but as a result you can no longer update
observation context from within the tested code itself.
* Breaking: To use Experiment as a decorator you must now use the `Experiment.decorator` classmethod instead
* Breaking: Result.observations renamed to Result.candidates

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* Deprecate Experiment.run() in favour of Experiment.conduct()

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* Allow Control cases to specify names for their observations as
documented (https://github.com/joealcorn/laboratory/issues/10)

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* Started logging changes!
* Fixed issue with observations persisting through experiment runs when
using decorator (https://github.com/joealcorn/laboratory/pull/9)