Add getKeys methoed.
Return EArray object at some methods.
Add an argument in the constructor to set a default delimiter.
Add test
update gitignore
Update comment
Update README
Update gitignore and remove test report files.
Update tests
Update tests
Update tests
Add exists method
Support delete method with delimeter.
Update comment
Merge pull request #3 from kohkimakimoto/dev-v2

development v2