Deprecate the metric methods in sprockets_statsd.tornado.RequestHandler

[nvllsvm]

What
Deprecate the following methods of sprockets_statsd.tornado.RequestHandler in favor of the methods provided by self.application.statsd_connector

• increase_counter ⟶ incr
• record_timing ⟶ timing
• execution_timer ⟶ timer

Why
The RequestHandler specific methods differ slightly from the methods provided by the connector. Specifically, they concatenate method arguments to create the metric path. This can cause confusion when doing something like this:

increase_counter('errors.retries', 5)

One might expect that to increment errors.retries by 5, but it actually increases errors.retries.5 by 1.

Also - these methods are specific only to a Tornado application. I've started using sprockets-statsd in a non-Tornado application and would like consistent method calls across my applications.