rename File.exists? to File.exist?

exists? is marked as obsolete in the API doc [madx]

lib/fakefs.rb

@@ -95,7 +95,7 @@ module FakeFS
     def chown_R(user, group, list, options={})
       chown(user, group, list, options={})
     end
-    
+
     def touch(list, options={})
       Array(list).each do |f|
         directory = File.dirname(f)
@@ -116,10 +116,14 @@ module FakeFS
       parts * PATH_SEPARATOR
     end
 
-    def self.exists?(path)
+    def self.exist?(path)
       FileSystem.find(path) || false
     end
 
+    class << self
+      alias_method :exists?, :exist?
+    end
+
     def self.directory?(path)
       if path.respond_to? :entry
         path.entry.is_a? MockDir