Added StyleCop in ComboRox.Core
Refactored ComboRox.Core after adding StyleCop
Added StyleCop in ComboRox.Models
Refactored ComboRox.Models after adding StyleCop
Added StyleCop in ComboRox.Core.UnitTests
Refactored ComboRox.Core.UnitTests
Merge pull request #2 from ssnenov/stylecop

Merging stylecop branch after adding StyleCop and refactoring the projects
Fixed some tabs indents
Changed 'Release' configuration in ComboRox.sln
Added new event 'DataPrepared' in ModulesManager
Added new public methods in ModulesManager
Refactored ComboRox.Core
Refactored Unit tests
Create async method PrepareAsync in DataPreparation
Added simple 'Guard'
Merge pull request #3 from ssnenov/guard

Implemented simple 'Guard'
Changed access modifiers in RequirementBase
Refactored ModulesManager
Initialized 'Sorting' module
Added models for sorting module