Maintenance Release

General enhancements:

• make sure get/put label index goes through cache layer
• don't send non-existant blocks for /specificblocks
• add mutation order id and data UUID to mutation log
• make data name parsing more robust
• add labelsz /counts with enhanced testing; fixes #306
• refactor TOML config, esp. for testing; add server-wide blobstore
• add GET /api/repo/<uuid>/branch-versions/<name>
• add ability to turn off downres for /split-supervoxel in labelmap
• add POST /maxlabel and complete POST /nextlabel; fixes #307
• add bulk GET /indices for labelmap; fixes #309
• load in-memory labelmap of master branch on startup

Logging changes:

• add kafka logging for POST /nextlabel and add documentation
• add optional user id to annotation mutation kafka messages; fixes #305
• add general POST logging and separate blobstore config

Bug fixes:

• fix uuid parsing
• prevent GC of underlying byte slices when using aliasing

For developers:

• Build scripts and guide are compatible with conda 4.6
• conda-recipe: Use conda compilers on both Mac and Linux