Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - sculpin/sculpin v2.0.0 requires composer/composer 1.*@dev -> no matching package found.
    - sculpin/sculpin 2.0.x-dev requires composer/composer 1.*@dev -> no matching package found.
    - sculpin/sculpin dev-master requires composer/composer 1.*@dev -> no matching package found.
    - sculpin/sculpin 1.0.x-dev requires composer/composer 1.*@alpha -> no matching package found.
    - Installation request for sculpin/sculpin @dev -> satisfiable by sculpin/sculpin[1.0.x-dev, dev-master, 2.0.x-dev, v2.0.0].

Potential causes:
 - A typo in the package name
 - The package is not available in a stable-enough version according to your minimum-stability setting
   see <https://groups.google.com/d/topic/composer-dev/_g3ASeIFlrc/discussion> for more details.

Read <http://getcomposer.org/doc/articles/troubleshooting.md> for further common problems.