Fix requires
Add more examples to the README
Bump version
Fix example in README
Remove DB drivers as runtime deps, switch example to Sqlite
README formatting
Merge branch 'datastore-namespace'

Conflicts:
	lib/data_task.rb
Add Adapter abstract base class
Alias adapter-specific test data creation methods; use transactions only when provided
Use an options hash for optional create_test_data arguments
Enable adapter-specific testing config; refactor inits and arounds in tests
Add HDFS adapter and unit test
Remove random require for DNE file
Merge branch 'hdfs' into datastore-namespace