title: import common dependencies to package.json?
body: <p>At our company we have at the moment 5 web applications that are built using Gulp. For Gulp, we have a common buildfile that all applications use (and override certain parts of it if needed). 
  This makes it very easy to add features or fix bugs in all projects at the same time. However, I still need to edit the package.json file in each project separatly if I want to add a new npm dependency or bump a version for an existing one.</p>
  
  <p>What I would like to accomplish is to a "base file" where all the common dependencies are configured, and the I would like to import that into the "local" package.json in each project. It would also be nice if each project could add more dependencies than the ones registered as common.</p>
  
  <p>Is it possible to do this?</p>