3: Non-relational persistence 

Implement findById and findAll for lucene persistence.

Task-Url:
https://github.com/iris-email-client/iris-delta-programming/issues/issue/3
3: Non-relational persistence 

Implement FolderDAO in Lucene.

Task-Url:
https://github.com/iris-email-client/iris-delta-programming/issues/issue/3