Now possible to ignore file hierarchies.

For example, if there's a tmp/ directory with 100k subdirectories,
scanning can be made a lot faster by ignoring "*/tmp".

lib/fuzzy_file_finder.rb

@@ -217,6 +217,7 @@ def inspect #:nodoc:
     def follow_tree(directory)
       Dir.entries(directory.name).each do |entry|
         next if entry[0,1] == "."
+        next if ignore?(directory.name) # Ignore whole directory hierarchies
         raise TooManyEntries if files.length > ceiling
 
         full = File.join(directory.name, entry)