Add list view tests

Also,
 * moved fetch out of the list view
 * removed unused #last() function
 * put test setup lines in their own tiny file.
 * added data-cover to view script tags for code coveage reports.

test/views/message_view_test.js

@@ -1,5 +1,3 @@
-mocha.setup("bdd");
-window.assert = chai.assert;
 describe('MessageView', function() {
   var message = Whisper.Messages.add({
     threadId: 'test-thread',