Test environment for integration tests

Added test IMDB and default values for it.
Authentication WIP and integration tests

Added authentication infrastructure, added integration tests for Posts DAL.
Merge pull request #16 from AlexWyrm/master

Test environment for integration tests.
Added authentication infrastructure (though I have no idea why it's not working properly) and integration tests for Post DAL (though I have no idea why shouldCreatePost() is throwing error).