Variant price range bug fix

Squashed a new bug created from
https://github.com/ongoworks/reaction-core/commit/164dfd86b1bce4357abc70
17ac5861e19232adb4

related to #202
Update to Mongo.Collections
Merge branch 'v0.2.1' of https://github.com/ongoworks/reaction-core into v0.2.1
Add ability to pass initial user in settings.json

Format:
  "reaction": {
    "METEOR_USER": "Administrator",
    "METEOR_AUTH": "password",
    "METEOR_EMAIL": "root@localhost"
  },
Add ability to pass initial user in settings.json
Merge remote-tracking branch 'upstream/v0.2.1' into HEAD