Additional features added to prerelease

 * Improve how build files get searched for. Consult you a [Doug Neiner](https://github.com/dcneiner) for great good! 
 * Add ability to persist build data as JSON or YAML formatted file.
 * Add a `nopack` feature to allow building without creating a package. Added so the CLI can test a build's validity w/o having to overwrite the package each time you test.
 * Support a call to check for the existence of a valid build file in the repository.