Added YARDoc method signatures, did more cleaning up of Torm::RulesEngine

* Verbose mode was not doing anything, so removed it.
* Loading/saving actually uses Torm.default_rules_file as default.
* New rules engines can specify a save file, or they use the default.
* Removed Torm::RulesEngine.rules_file. It referenced Rails and was replaced by Torm.default_rules_file
* Torm::RulesEngine#conditions_whitelist is an internal value, so removed it from the initializer and demoted the accessor to a reader, for testing accessibility.
Updated readme example to showcase Torm.set_defaults and Torm.instance

These are the most likely ways to use it. I also showcase Torm::RulesEngine.new, but at the end of the primary example.
Introduced RulesEngine#add_rules syntax with a block

This makes a large rules file more readable by grouping variations of a rule in a block.
Version 0.1.0

APIs were broken, features were added. Time for a release