update 3/2/14:
It seems that now the book supports the official bootstrap package , which you can get through:
$ meteor add twbs:bootstrap
old answer:
It seems that they did not update the book for the new packaging system. You have options when it comes to which version of the bootstrap to use. I'm not sure which one the book expects, but you can try the default that comes with the meteor:
$ meteor add bootstrap
Note that we are replacing the mrt meteor.
If you want to download bootstrap 3, you can try:
$ meteor add mizzao:bootstrap-3
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