Prepare stage and prod settings for staticfiles migration (bug 1013865)
Merge pull request #201 from yohanboniface/bug-1013865-staticfiles-fixes

Prepare stage and prod settings for staticfiles migration (bug 1013865)
Accept package.json files without install.rdf (bug 1037201)

This adds support for addons created with jpm.
Merge pull request #189 from mstriemer/jpm-addons-1037201

Accept package.json files without install.rdf (bug 1037201)
Adding travis img
Merge pull request #203 from yohanboniface/adding-travis-img

Adding travis img