WIP getstream.io client in pure GO.

• Authentication
• Add, list all, and remove an activity.

• Listing/paging options.
• Follows/unfollows.
• Subscription.
• Aggregated feeds support.
• Notification feeds support.

• Ability to use pass and retreive a custom structs (w/ embedded *getstream.Activity) ala sqlx style.
• Real-time clients w/ channels.

MIT