Paste - kill tabs

Summary:
merge paste create and paste list into a single controller.  Add a "filter list"
to the left hand side and have new "create w/ recent", "my" and "all" views.  UI
wrinkle -- "create w/ recent" does not paginate the recent pastes and instead
upsells the user to the new "all" view.

Also includes a business logic clean up or two for simplicity of code.

Test Plan:
- created a paste from the UI
- tried to create a paste with title and no body
- tried to create a paste with no title and no body
- viewed the paste list on "create" view
- viewed the paste list on "author" view
- viewed the paste list on "all" view
- viewed page 2 of the paste list for "author" and "all" views
- "forked" a given paste through completion

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, epriestley, btrahan

Maniphest Tasks: T631

Differential Revision: 1198

src/aphront/default/configuration/AphrontDefaultApplicationConfiguration.php

@@ -315,10 +315,9 @@ class AphrontDefaultApplicationConfiguration
       '/status/$' => 'PhabricatorStatusController',
 
       '/paste/' => array(
-        '$' => 'PhabricatorPasteCreateController',
-        'list/' => 'PhabricatorPasteListController',
+        '$' => 'PhabricatorPasteListController',
+        'filter/(?P<filter>\w+)/$' => 'PhabricatorPasteListController',
       ),
-
       '/P(?P<id>\d+)$' => 'PhabricatorPasteViewController',
 
       '/help/' => array(