Fixes #13 (Log output to Rails console in Rails 4)
Deprecate `(host, port, type)` constructor arguments in favor of options hash.
Feature: Add SSL certificate to logger

The tcp input for logstash allows the data to be transmitted securely
using an SSL certificate. This commit adds a fourth (optional) argument
to the logger to specify the path of an ssl certificate. If this is set
then it will use a secure socket.