GRN-59: Implemented pagination on the API call (#370)

* Added the env variable and functionality to paginate the call to the bbbapi

* Update user.rb

config/application.rb

@@ -89,5 +89,8 @@ module Greenlight
 
     # Configure which settings are available to user on room creation/edit after creation
     config.room_features = ENV['ROOM_FEATURES'] || ""
+
+    # The maximum number of rooms included in one bbbapi call
+    config.pagination_number = ENV['PAGINATION_NUMBER'].to_i == 0 ? 25 : ENV['PAGINATION_NUMBER'].to_i
   end
 end