unsubscribe to channels before re-subscribing
cleanup test-related code
Merge pull request #152 from ajb/redo-pr-76

unsubscribe channels before re-subscribing
add dummy adapter
add disabled example to sync.yml template
Add license to gemspec
remove support for Ruby 1.9.2
Merge pull request #159 from ajb/remove-1.9.2

remove support for Ruby 1.9.2
Merge pull request #153 from ajb/null-adapter

Null (dummy) adapter
graceful failure if websocket script is blocked
Merge pull request #160 from ajb/graceful-failure

graceful failure if websocket script is blocked
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