v6.2.0

Changes from this release

[Bug] #231: Fix LiquidHandleBuilders method desired_mode docstring preventing Travis build
[Bug] #233: Change Protocol.propagate_properties to use Well.set_properties
[Feature] #221: Add warm_35 incubation location
[Feature] #229: Update LiquidHandle instruction with ‘density’ parameter and ‘positive_displacement’ mode
[Feature] #235: Add support for specifying different Protocol subclasses in harness.run
[Support] #228: Remove Phabricator references
[Support] #232: Move and update license, authors, contributing to top-level
[Support] #232: Update various date, emails and copyright references
[Support] #236: Support auto-deploy from travis