Shared folder target path can be a Windows path [GH-1688]

CHANGELOG.md

@@ -38,6 +38,7 @@ BUG FIXES:
   - Sharing folders works properly if ".profile" contains an echo. [GH-1677]
   - `vagrant ssh-config` IdentityFile is only wrapped in quotes if it
     contains a space. [GH-1682]
+  - Shared folder target path can be a Windows path. [GH-1688]
 
 ## 1.2.4 (July 16, 2013)
 

plugins/kernel_v2/config/vm.rb

@@ -326,7 +326,7 @@ module VagrantPlugins
           guestpath = Pathname.new(options[:guestpath])
           hostpath  = Pathname.new(options[:hostpath]).expand_path(machine.env.root_path)
 
-          if guestpath.relative?
+          if guestpath.relative? && guestpath.to_s !~ /^\w+:/
             errors << I18n.t("vagrant.config.vm.shared_folder_guestpath_relative",
                              :path => options[:guestpath])
           else