This is an updated version of #857 with some bug fixes and minor aesthetic changes.
The option to add an engine path is --add-engines-path and the config option is :engine_paths.
To specify all subdirectories, use *. For example engines/*
Add support for configurable engines path
This commit adds an `engines_path` option to brakeman to allow users to add
engines that the application uses. The path to the engines can either be
absolute or relative to the project root.
Rename method for clarity
Add --engines command line option
Merge branch 'jsyeo-config-engines' of https://github.com/jsyeo/brakeman
Some improvements to engine path building
Include default engines directory
Add tests for engine path setting
Aesthetic updates to engine paths option