Extracted SQLiteDatabase interface
Added Equals method for Model classes.
Finished Testing of Samples and measurements DAOs
Removed unused method from SQLliteDatabase
Extracted database mock
Fixed Experiments tests
Extracted DatabaseMock to fully operational in-memory database
Merge pull request #1 from szimin18/simulator

Simulator
Added getters for collections.
Fixed minor naming issue
Merge branch 'pers'
git error (?!) fix
IMeasurementCalculator changes
Selective Exporter branch merge
Added connection establishing to Recorder; Skeletal tests for Recorder
Extracted IPersistenceManager.
Minor fixes
Added  PersistanceFactory.
Refactorization; no concrete exporters
csv and xls exporter classes