Changelog for Release 0.6.0-alpha (06/17/2015)

• Adds DDlog for writing applications in Datalog-like syntax.
• Adds support for incremental development cycles.
• Adds preliminary support for Postgres-XL backend.
• Simplifies installation on Ubuntu and Mac with a quick installer that takes care of all dependencies.
• Drops maintenance of AMI favoring the new quick installer.
• Fixes sampler correctness issues.
• Drops "FeatureStatsView" view due to performance issues.
• Corrects various issues.
• Starts using Semantic Versioning for consistent and meaningful version numbers for all future releases.