build(aio): refactor dgeni packages

This is to tidy up the `author-packagse`, which currently duplicates a
lot of the configuration in the main packages. We need to
DRY this up so that we don't fall foul of a change in one being missed in
the other.

aio/tools/transforms/angular-base-package/rendering/toId.spec.js

@@ -0,0 +1,14 @@
+var factory = require('./toId');
+
+describe('toId filter', function() {
+  var filter;
+
+  beforeEach(function() { filter = factory(); });
+
+  it('should be called "toId"', function() { expect(filter.name).toEqual('toId'); });
+
+  it('should convert a string to make it appropriate for use as an HTML id', function() {
+    expect(filter.process('This is a big string with €bad#characaters¢\nAnd even NewLines'))
+        .toEqual('This-is-a-big-string-with--bad-characaters--And-even-NewLines');
+  });
+});