Add javelin_tag(), convert easy callsites

Summary:
  - Implements `javelin_tag()`, which is `javelin_render_tag()` on top of `phutil_tag()` instead of `phutil_render_tag()`.
  - Manually converts all or almost all of the trivial callsites.

Test Plan:
  - Site does not seem any more broken than before.

Reviewers: vrana

Reviewed By: vrana

CC: aran

Differential Revision: https://secure.phabricator.com/D4639

src/applications/diffusion/controller/DiffusionCommitEditController.php

@@ -62,15 +62,15 @@ final class DiffusionCommitEditController extends DiffusionController {
         ->setValue($proj_t_values)
         ->setID($tokenizer_id)
         ->setCaption(
-          javelin_render_tag(
+          javelin_tag(
             'a',
             array(
               'href'        => '/project/create/',
               'mustcapture' => true,
               'sigil'       => 'project-create',
             ),
-            'Create New Project'))
-            ->setDatasource('/typeahead/common/projects/'));;
+            pht('Create New Project')))
+        ->setDatasource('/typeahead/common/projects/'));;
 
     Javelin::initBehavior('project-create', array(
       'tokenizerID' => $tokenizer_id,