Addressed server root path which can be null.
Implemented SaveAsync method.
Removed IDispose implementation from UnitOfWork.
Implemented LazyUnitOfWork.
Registered LazyUnitOfWork to DependencyResolver.
Introduced SaveUnitOfWorkActionFilter.
Implemented SaveUnitOfWorkActionFilter.
Registered SaveUnitOfWorkActionFilter as global filter.
Addressed code analysis errors.
Fixed not awaiting to save unit of work.
Merge pull request #7 from jwChung/save-unit-of-work-action-filter

Save unit of work action filter