clustermq 0.8.7

• Q now has max_calls_worker argument to avoid walltime (#110)
• Submission messages now list size of common data (drake#800)
• All default templates now have an optional cores per job field (#123)
• foreach now treats .export (#124) and .combine (#126) correctly
• New option clustermq.error.timeout to not wait for clean shutdown (#134)
• SSH command is now specified via a template file (#122)
• SSH will now forward errors to the local process (#135)
• The Wiki is deprecated, use https://mschubert.github.io/clustermq/ instead