* Add swagger-spec generator from loopback-explorer (Miroslav Bajtoš)
 * Update dependencies (Miroslav Bajtoš)
 * Move code generator to "codegen" subfolder (Miroslav Bajtoš)
 * Update package.json (Rand McKinney)
 * Update README.md (Rand McKinney)
 * Fix bad CLA URL in CONTRIBUTING.md (Ryan Graham)