Pickup new node_modules/ when they are installed

[irae]

During development, sometimes you git pull changes and need to install a new package. I am not proposing Mendel should install the packages, but I think we should track the dependencies.

IIRC, when filesystem watcher scans folders, we don't wildcard watch for node_modules for performance reasons. But we do watch every file we require. I am thinking to fix this, we just need to watch for new node_modules/ we know are missing.

For instance, this is the proposed workflow:

1. Git pull something, a new file or existing file within variational or base folder requires a new dependency foo.

2. Dependency foo is not found

   2.1. Currently I think we do not watch for the dependency foo.
   2.2. Suggesting we add foo to a list of dependencies we are looking for and watch node_modules/

3. User installs foo manually (or maybe they have a grunt task for it).

   3.1. Currently user needs to stop daemon and start again
   3.2. Suggesting we get events on node_modules folder, if it matches array of missing dependencies (in example array is ['foo']) we then require the entry and start watching for changes.