Dwave-system

Fixes
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- Docstring formatting fixes https://github.com/dwavesystems/dwave-system/pull/387
- Chain strength documentation fixes https://github.com/dwavesystems/dwave-system/pull/391
- Fix broken documentation links https://github.com/dwavesystems/dwave-system/pull/396

Features
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* `DWaveCliqueSampler` can fail over https://github.com/dwavesystems/dwave-system/pull/395
* Add `MockLeapHybridDQMSampler` https://github.com/dwavesystems/dwave-system/pull/399

New Features
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- Support for problem labels (all samplers now accept an optional `label` kwarg)
- Label on `VirtualGraphComposite` flux bias measurements

Fixes
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- Hybrid samplers now properly select the latest version of an appropriate hybrid solver
- Python 2 cruft cleanup

New Features
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* `ReverseBatchStatesComposite` now inherits from `dimod.Initialized` and by default reverse anneals
* `ReverseAdvanceComposite` now reverse anneals by default with schedule `[[0, 1], [1, 0.35], [9, 0.35], [10, 1]]`

Fixes
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* `EmbeddedStructure` is now deep copy-able
* Embedding composites now raise correct warnings even when chain strengths are provided as a dict

Changes
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* Many `dwave.embedding` utility functions have been migrated to `minorminer`, though they are still imported into their original namespaces

Fixes
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- Doctest now passes

New Features
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* `LeapHybridSampler.min_time_limit` method
* Improved documentation of `LeapHybridDQMSampler`
* More sanity checks on `time_limit` in `LeapHybridDQMSampler`

Changes
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* `LeapHybridDQMSampler.sample_dqm`'s `compressed` keyword argument has been deprecated in favor of `compress`

Fixes
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- Correctly propagate kwargs through `LeapHybridDQMSampler.sample`