Unpin Meteor from version 1.4.1 in Dockerfile
Unpin Meteor from version 1.4.1 in Dockerfile

This reverts commit 5c01c745e5ee98196348f8bdf5980df66ac93d4b. Changes
merged in from upstream allow Meteor to start successfully while running
the latest version, so this workaround is no longer necessary.

etremel/signmeup,etremel/signmeup,etremel/signmeup