dpack configuration file

[GMSteuart]

As a developer I want to be able to modify dpack's default behavior by providing overrides in a configuration. Initial configuration would be provided in a package.json file, then support for other methods such as a dpack.json file will be implemented.

• Override name of dpack file
• Override path of saved files

[nmushegian]

The fact that this is a node program is incidental, we are going for unix approach not npm package tool