composer support

fixes #25

But you should update a few values, composer.phar validate output:

./composer.json is valid, but with a few warnings
See http://getcomposer.org/doc/04-schema.md for details on the schema
License "-" is not a valid SPDX license identifier, see http://www.spdx.org/licenses/ if you use an open license
authors.0.email : invalid value (-), must be a valid email address