Dav4rack library upgraded to the latest stable version

Gemfile

@@ -4,7 +4,7 @@ gem 'rubyzip', '>= 1.0.0'
 gem 'zip-zip' # Just to avoid 'cannot load such file -- zip/zip' error
 gem 'simple_enum'
 gem 'uuidtools', '~> 2.1.1'
-gem 'dav4rack', '=0.2.11'
+gem 'dav4rack'
 
 group :production do
   gem 'nokogiri', '>= 1.5.10'

lib/redmine_dmsf/webdav/resource_proxy.rb

@@ -1,6 +1,7 @@
 # Redmine plugin for Document Management System "Features"
 #
 # Copyright (C) 2012    Daniel Munn <dan.munn@munnster.co.uk>
+# Copyright (C) 2011-14 Karel Picman <karel.picman@kontron.com>
 #
 # This program is free software; you can redistribute it and/or
 # modify it under the terms of the GNU General Public License
@@ -38,11 +39,9 @@ module RedmineDmsf
         else # We made it all the way to DMSF Data
           @resource_c = DmsfResource.new(*args)
         end
-
-        @resource_c.accessor= self unless @resource_c.nil?
+        @resource_c.accessor = self if @resource_c
       end
       
-      
       def authenticate(username, password)
         # Bugfix: Current DAV4Rack (including production) authenticate against ALL requests
         # Microsoft Web Client will not attempt any authentication (it'd seem) until it's acknowledged
@@ -50,7 +49,7 @@ module RedmineDmsf
         # going to fork it to ensure compliance, checking the request method in the authentication
         # seems the next best step, if the request method is OPTIONS return true, controller will simply
         # call the options method within, which accesses nothing, just returns headers about dav env.
-        return true if ( @request.request_method.downcase == "options" && ( path == "/" || path.empty? ) )
+        return true if @request.request_method.downcase == 'options' && (path == '/' || path.empty?)
         User.current = User.try_to_login(username, password) || nil        
         return !User.current.anonymous? unless User.current.nil?
         false