v0.5.0

Changes:

• Skipped Buildout (#49).
• Replaced mongodb by sqlalchemy (#51).
• Simplified Makefile and skipped conda targets (#75).
• Add Makefile targets for docker, bumpversion and coverage analysis related tasks (#67).
• Removed unused config module (#70).

New Features:

• Provided a Dockerfile for building Twitcher (#67).
• Provide AdapterInterface to allow overriding store implementations with configuration setting twitcher.adapter (#67).
• Add version auto-update (number and date) of these 'changes' with bump2version (#67).

Fixes:

• Update requirements with missing dependencies when building docker image.
• Various fixes (#74, #73, #72, #71)