You can now add any bower module when creating a new app with the --bower flag. Simply put a comma separated list of Bower packages (in quotes). For example, to install jQuery, Foundation, Backbone.js & Head.js:
$ tesla myapp --bower "jquery, foundation, backbone, headjs"
This will add all 4 packages to your bower.json file. When the app has been created, run the following command:
$ cd myapp && npm install && tesla install
This will install all npm & bower packages. "tesla install" will also attempt to automatically inject links to all your bower packages into you html templates (stylesheets in the head, script in the footer).