Added a user lookup interface and a simple array storage implementation, along with a test case
Added a query object for the public key fetching instead of using iterators to loop through the data. Currently the query object only supports a limit and an offset. Also added tests
Changed the comment regarding the auth configuration
Added support for multiple private keys per user, with RO/RW-access
Merge pull request #307 from rexxars/issue-289

Multiple private keys per user + RO/RW access level