Improve the headers for the querying
Adjust the JWT terminology to be more technically accurate
Update docs to include errors and evaluate the return values
Touch up the metadata documentation
Expand query headers to conform with Markdown
Touch up message sending docs

* Match parameter names accurately
* Consistently use errors and evaluate return values
* Add correct docs about the `options` dictionary
Add error and check return value
Touch up sync docs
Update typing indicator docs
Merge pull request #10 from layerhq/blake-content-review

Blake content review