make branch
Merge branch 'plugin_storage_spike' of github.com:tdiary/tdiary-core into plugin_storage_spike
Merge branch 'master' into plugin_storage_spike
simple implementation of default plugin storage using PStore
exhance TDiary::Plugin to use plugin storage
Merge branch 'master' into plugin_storage_spike
close plugin storage after evaluating all plugins
write document of how to implement plugin storage in IO classes
enable reading to access to Configuration.io_class
fix error in spec: add DummyIO implements plugin_* class methods
implement delete and keys into plugin storage
Merge branch 'master' into plugin_storage_spike
store String only to plugin storage
Merge branch 'master' into plugin_storage_spike
Merge branch 'master' into plugin_storage_spike
Merge pull request #431 from tdiary/plugin_storage_spike

[WIP] プラグイン用のストレージをIOに統合する