DRT-33
- Added new classes to JiraModels: Filter.cs, SprintsData, View;
- Added JiraService class to generate and set RapidViews and Sprints;
- added RapidView method in ApiUrls.cs and updated RapidViews;
- Count authors errors when issue has no worklog but has commits;
- updated RapidView class;
- added DateTime StartDate and EndDate to sprint;
- updated Policies;
- Generate timesheet for sprint;
- added GetRapidView mehtod to RestApiRequests.cs;