Issue title: Cannot remove telescope-tags package
 Issue body: Using "meteor remove telescope-tags" to remove telescope-tags package, telescope-tags is removed in /.meteor/packages.
However, pparker@example.com is still in /.meteor/versions, even remove it manually. 

Is it due to no version # in /packages/telescope-tags/package.js?
 Comments: 
 Comment 0: That's strange… In any case if the package is not in `/packages` I don't think it can be loaded. 
 Comment 1: Is it due to no version number in /packages/telescope-tags/package.js?
The default version number is 0.0.0
 Comment 2: Maybe, but I don't think so. It might just be a bug in Meteor? Are you sure the package is really loaded? Do categories still appear in the app?
 Comment 3: Yes, it might be a bug in Meteor.

You can run "meteor remove telescope-tags" and "git status"
Get "modified:   .meteor/packages"
But no "modified:   .meteor/versions"

The package is loaded and categories still appears.
 Comment 4: Hmm… So the package really is removed from `.meteor/packages` but still
gets loaded? That's definitely a bug.

On Sun, Apr 12, 2015 at 1:03 PM, xuanus <pparker@example.com> wrote:

> Yes, it might be a bug in Meteor.
>
> You can run "meteor remove telescope-tags" and "git status"
> Get "modified: .meteor/packages"
> But no "modified: .meteor/versions"
>
> The package is loaded and categories still appears.
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/TelescopeJS/Telescope/issues/901#issuecomment-91983433>
> .
>

{'source': 'GithubIssues', 'repo_name_with_owner': 'TelescopeJS/Telescope', 'issue_id': 67372591, 'repo_stars': 4242.0}