Provide convenience method addTextCrumb() to PhabricatorCrumbsView

Summary: We currently have a lot of calls to `addCrumb(id(new PhabricatorCrumbView())->...)` which can be expressed much more simply with a convenience method. Nearly all crumbs are only textual.

Test Plan:
  - This was mostly automated, then I cleaned up a few unusual sites manually.
  - Bunch of grep / randomly clicking around.

Reviewers: btrahan, chad

Reviewed By: btrahan

CC: hach-que, aran

Differential Revision: https://secure.phabricator.com/D7787

src/applications/diviner/controller/DivinerBookController.php

@@ -27,10 +27,9 @@ final class DivinerBookController extends DivinerController {
 
     $crumbs = $this->buildApplicationCrumbs();
 
-    $crumbs->addCrumb(
-      id(new PhabricatorCrumbView())
-        ->setName($book->getShortTitle())
-        ->setHref('/book/'.$book->getName().'/'));
+    $crumbs->addTextCrumb(
+      $book->getShortTitle(),
+      '/book/'.$book->getName().'/');
 
     $header = id(new PHUIHeaderView())
       ->setHeader($book->getTitle())