Fix how to run a task from module
Merge pull request #640 from kenjis/fix_modules

Fix how to run a task from module
Added docs for oil#220
Merge pull request #641 from sagikazarmark/1.8/develop

Added docs for oil#220
Add debug option for oil test, and fixes some option explanations
Merge pull request #642 from kenjis/add_oil_test_debug

Add debug option for oil test
Fix typo
Fix sample of unique() method
Merge pull request #644 from jmmendivil/1.8/develop

Fix typo
Merge pull request #645 from hirayummy/correction_unique_sample

Fix sample of unique() method
本家変更分をmerge