[extension] move check processing to its own method
[extension] check extensions, standalone scheduling, gc metrics
[extension] test standalone check extensions
[extension] check request publishing for check extensions
[extension] adjusted log lines for consistency
[extension] test check extension request scheduling, extension require needs expanded path
[extension] no gc profiler for ruby < 1.9.3
[extension] updated changelog
[extension] changelog edit
Merge pull request #473 from portertech/extension

Check extension support