Tmichelet/ana 570/export dashboard

to test: 
   make test TESTS=test_dashboard.TestDashboard
   make test TESTS=test_project


you'll have to add the following credentials: 
   test_dashboard_project_id = 'co8r98zq367cwhw4ugeht7aw2honroep'
   test_dashboards_id = '14585'
   test_dashboard_id = '97281dec00f8'
   test_dashboard_name = 'First Tab'
   user_id = 'YOUR USER ID' (like a hash)