Grunt-based dependencies, minification, and unit testing

Grunt-based dependencies, minification, and unit testing

Files to support Grunt-based browser staff building.

* Fetching dependencies (angularjs, etc.)
* Runs unit tests with grunt-karma
* Concatenates and minifies files with grunt-uglify

* Moved unit tests into web directory
* Taught t_base_js.tt2 how to load the minified version of the file

TODO:

* minifiying non-core files and (possibly) copying them into the build
  directory.
* Support for using non-minified files via browser option?
* Makefile options for building, testing, and copying the correct files
  into the actual web directory (instead of cp -r web/*)
* Build docs

Signed-off-by: Bill Erickson <berick@esilibrary.com>