composer require silverstripe/comments:*@dev
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - silverstripe/comments dev-master requires colymba/gridfield-bulk-editing-tools dev-master -> no matching package found.
    - Installation request for silverstripe/comments *@dev -> satisfiable by silverstripe/comments[1.1.x-dev, dev-master].
    - Conclusion: remove silverstripe/framework 3.1.2
    - silverstripe/comments 1.1.x-dev requires silverstripe/framework 3.0.* -> satisfiable by silverstripe/framework[3.0.2.1, 3.0.3, 3.0.4, 3.0.5, 3.0.6, 3.0.7, 3.0.8].
    - Can only install one of: silverstripe/framework[3.1.2, 3.0.2.1].
    - Can only install one of: silverstripe/framework[3.1.2, 3.0.3].
    - Can only install one of: silverstripe/framework[3.1.2, 3.0.4].
    - Can only install one of: silverstripe/framework[3.1.2, 3.0.5].
    - Can only install one of: silverstripe/framework[3.1.2, 3.0.6].
    - Can only install one of: silverstripe/framework[3.1.2, 3.0.7].
    - Can only install one of: silverstripe/framework[3.1.2, 3.0.8].
    - Installation request for silverstripe/framework == 3.1.2.0 -> satisfiable by silverstripe/framework[3.1.2].

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.

Installation failed, reverting ./composer.json to its