v0.8.0

Changes:

• Queries can now be authenticated.
• at() method to walk around the db added.
• No need to worry about adding '.json' to url or leading and trailing slashes.
• More documentation
• delete() renamed to remove()
• Can now send queries with parameters like orderBy and limitToFirst
• Cleaner syntax (to be made even cleaner later)
• Reference to database has its own independent lifetime.