Cleanup shutdown procedure
Force exit after clean shutdown
Merge pull request #224 from quixoten/clean_shutdown

Clean shutdown
Bump version to v3.3.6
actually compile the protos
Add RuboCop
Lint/AssignmentInCondition
Lint/BlockAlignment
Lint/ParenthesesAsGroupedExpression
Lint/StringConversionInInterpolation
Lint/UnderscorePrefixedVariableName
Lint/UnusedBlockArgument
Lint/UnusedMethodArgument
Lint/UselessAssignment
Style/AccessModifierIndentation
Style/AccessorMethodName
Style/AlignArray
Style/AndOr
Style/BarePercentLiterals
Style/BlockEndNewline