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emcee 2.3 release

Major breaking changes

• Remove PTSampler and point to willvousden/ptemcee instead
• Remove threads argument and only use pool; perhaps move this to sample instead
• Remove MPIPool and switch to adrn/schwimmbad
• Reshape outputs to (nsteps, nwalkers, ndim) instead of (nwalkers, nsteps, ndim)

New features

• Add a progress indicator to sample
• Add vectorized calls to lnprob (#53 and #208, for example)
• Add a more expressive blob interface
• Test and add alternative autocorr methods
• Switch to py.test and refactor unit tests

Docs

• Turn off those annoying coverage comments!!
• Move to RTDs for better versioning
• Add more complete discussion of autocorrelation time analysis and alternative methods
• Implement open source best practices