Drive all Celerity operations from the new map

Summary:
Ref T4222.

  - Removes the old map and changes the CelerityResourceMap API to be entirely driven by the new map.
  - The new map is about 50% smaller and organized more sensibly.
  - This removes the `/pkg/` URI component. All resources are now required to have unique names, so we can tell if a resource is a package or not by looking at the name.
  - Removes some junky old APIs.
  - Cleans up some other APIs.
  - Added some feedback for `bin/celerity map`.
  - `CelerityResourceMap` is still a singleton which is inextricably bound to the Phabricator map; this will change in the future.

Test Plan:
  - Reloaded pages.
  - Verified packaging works by looking at generated includes.
  - Forced minification on and verified it worked.
  - Forced no-timestamps on and verified it worked.
  - Rebuilt map.
  - Ran old script and verified error message.
  - Checked logs.

Reviewers: btrahan, hach-que

Reviewed By: hach-que

CC: chad, aran

Maniphest Tasks: T4222

Differential Revision: https://secure.phabricator.com/D7872

scripts/celerity/install_merge.sh

@@ -1,9 +1,9 @@
 #!/bin/sh
 
-echo "src/__celerity_resource_map__.php merge=celerity" \
+echo "resources/celerity/map.php merge=celerity" \
   >> `dirname "$0"`/../../.git/info/attributes
 
 git config merge.celerity.name "Celerity Mapper"
 
 git config merge.celerity.driver \
-  'php $GIT_DIR/../scripts/celerity_mapper.php $GIT_DIR/../webroot'
+  'php $GIT_DIR/../bin/celerity map'