Removing meteorite cache and adding underscore-string no longer working

gistfile1.sh

ion $ cd ..
ion $ rm -Rf my-test-project/
ion $ mrt uninstall --system
Deleting ~/.meteorite. Note that previously installed projects will no longer work...
ion $ mrt create my-test-project
Fetching Meteor (branch: master)...
Downloading Meteor development bundle...
######################################################################## 100.0%
my-test-project: created.

To run your new app:
   cd my-test-project
   meteor
ion $ cd my-test-project/
ion $ mrt add underscore-string
Fetching Meteor (branch: master)...
Resolving dependencies..
Install custom Meteor build...
Meteor installed
underscore-string: no such package
ion $ cat smart.json
{
  "packages": {},
  "meteor": {
    "git": "https://github.com/meteor/meteor.git",
    "branch": "master"
  }
}
ion $ ls -la
total 32
drwxr-xr-x   7 ion  staff  238 Aug 23 21:27 .
drwxr-xr-x  13 ion  staff  442 Aug 23 21:27 ..
drwxr-xr-x   5 ion  staff  170 Aug 23 21:27 .meteor
-rw-r--r--   1 ion  staff   31 Aug 23 21:27 my-test-project.css
-rw-r--r--   1 ion  staff  194 Aug 23 21:27 my-test-project.html
-rw-r--r--   1 ion  staff  436 Aug 23 21:27 my-test-project.js
-rw-r--r--   1 ion  staff  114 Aug 23 21:27 smart.json
ion $ ls -la .meteor/
total 24
drwxr-xr-x  5 ion  staff  170 Aug 23 21:27 .
drwxr-xr-x  7 ion  staff  238 Aug 23 21:27 ..
-rw-r--r--  1 ion  staff    6 Aug 23 21:27 .gitignore
lrwxr-xr-x  1 ion  staff   84 Aug 23 21:27 meteorite -> /Users/ion/.meteorite/meteors/meteor/meteor/92b848fe1aff55658ae38d4e1b1aeb081370ca12
-rw-r--r--  1 ion  staff  169 Aug 23 21:27 packages