Implemented enhancements:

• Traces should be more granular #466
• Implement table locking #410
• Implement SHOW CREATE DATABASE #407
• Add configuration per engine instance and per session #109

Fixed bugs:

• pilosa holder has to sync up data with indexes #472
• No holder! #478

Merged pull requests:

• update license with year and org name #475
• Fix Apache License #473
• sql: add timing info to span traces #470
• sql: implement SHOW CREATE DATABASE statement #460
• *: implement LOCK and UNLOCK of tables #448
• sql: plan: Add SHOW CREATE TABLE [Fix #406] #435