Composer file adapted for dev environment

* When developing, full elcodi/elcodi package is required. Because of elcodi/elcodi
is defined replacing all its subpackages, only elcodi/elcodi will be installed (just in dev)
* In production, just simple packages are expected to be downloaded
Merge pull request #11 from elcodi/feature/store-composer-adapted-for-development

Composer file adapted for dev environment