Add methods for Green Hopper Rapid Views

**Summary of Changes:**
- Fixed lint
- Added methods:
 - getAllRapidViews - Returns all Rapid Views on the Jira server
 - getRapidViewConfig - Returns configuration object for a chosen Rapid View
 - getActiveSprintsForRapidView - Returns all sprints with the state 'ACTIVE' within a chose RapidView
 - getAllRapidViewData - Returns all data associated with a chosen Rapid View (including sprints and issues)
- Added tests for all new methods
- Updated documentation