Added SQLFlowTestBase + single data stream test
pom.xml
Addressed comments
Fixed license headers and formatting
Checkstyle fix
Merge branch 'feature/fixinterface' of https://github.com/caskdata/tigon into feature/sql-test-base
Merge branch 'develop' of https://github.com/caskdata/tigon into feature/sql-test-base
Changed process ready announcement location
Added announceReady error checking
Merge pull request #95 from caskdata/feature/sql-test-base

Refactoring SQLFlowTest