Revert "cache file access"

This reverts commit fde3538493.

Conflicts:

	lib/directoryindex.js

lib/mbtiles.js

@@ -10,9 +10,6 @@ var _ = require('underscore'),
     sm = new (require('sphericalmercator')),
     sqlite3 = require('sqlite3');
 
-var DirectoryIndex = require('./directoryindex');
-
-
 if (process.env.NODE_ENV === 'test') sqlite3.verbose();
 
 function noop(err) {
@@ -112,13 +109,26 @@ MBTiles.registerProtocols = function(tilelive) {
 
 // Finds all mbtiles file in the filepath and returns their tilesource URI.
 MBTiles.list = function(filepath, callback) {
-    DirectoryIndex.create(filepath).getList(callback);
+    filepath = path.resolve(filepath);
+    fs.readdir(filepath, function(err, files) {
+        if (err) return callback(err);
+        for (var result = {}, i = 0; i < files.length; i++) {
+            var name = files[i].match(/^([\w-]+)\.mbtiles$/);
+            if (name) result[name[1]] = 'mbtiles://' + path.join(filepath, name[0]);
+        }
+        return callback(null, result);
+    });
 };
 
 // Finds an mbtiles file with the given ID in the filepath and returns a
 // tilesource URI.
 MBTiles.findID = function(filepath, id, callback) {
-    DirectoryIndex.create(filepath).getID(id, callback);
+    filepath = path.resolve(filepath);
+    var file = path.join(filepath, id + '.mbtiles');
+    fs.stat(file, function(err, stats) {
+        if (err) return callback(err);
+        else return callback(null, 'mbtiles://' + file);
+    });
 };
 
 // Retrieve the schema of the current mbtiles database and inform the caller of