Additions

• Add in comments method to get the comments for a repository.
• Add in setRepositoryDescription method to set the short/full description for your own repositories.
• Add in webhooks method to get the webhooks for a repository you own.
• Add in createWebhook method to create a webhook for a repository you own.
• Add in createWebhookHook method to create a webhook hook for an existing webhook.
• Add in deleteWebhook method to delete a webhook for a repository you own.