Updated hook_node_update/delete to hook_entity_update/delete
Removed hook_node_insert
Changed the second parameter for disqus_help() to Drupal\Core\Routing\RouteMatchInterface.
The entity url is passed as absolute as $entity->url('canonical',array('absolute' => TRUE)).
disqus_entity_update and disqus_entity_delete checks if the disqus_comment field is present on the entity and then calls the DisqusAPI.
Removed 'version' parameter on DisqusAPI calls as api testing console on disqus.com/api/console returns response as Invalid argument with version.
Fixed Syntax error: changed $node to $entity in hook_entity_delete and hook_entity_update.
Replaced loop with if statement to check if the entity has the disqus field
Merge pull request #9 from angrycodr/Update-and-clean-up-hook_node_delete-insert-update

Updated hook_node_update/delete to hook_entity_update/delete. Removed hook_node_insert.