rest: fixed typo
test: minor fix in BaseRestletTest
rest: DefaultRestlet always returns 404
test: added DefaultRestletTest
test: added DataRestApiTest
test: refactoring in rest package

Added RestletTestHelper for handling request and response objects
rest: HelpRestApi copies constructor params before usage
test: added HelpRestApiTest
test: added RestletApplicationTest
test: slightly more tests in utils
data: inject DataSourceDb in  DataManager
test: added DataManagerTest
rest: inject DataManager in DataRestApi
test: more coverage in DataRestApiTest
test: added LogTest

... even though it doesnt do much