Add bower.json and Grunt task to prepare Bower release

Here's a simple, low-tech Grunt task for updating a `bower.json` and proving a copy-pastable script that makes a new branchless tagged commit with the build output in a `./dist` folder.

There's plenty of opportunity to refine this (perhaps in conjunction with @brianmhunt's work on #1039) but for now this is an easy first step that doesn't affect anything else.