Fix freeze issue on Windows(#321)

Windows assume file which starts with '\\'(or '//' in Emacs), is remote
file. If such file is passed to file API(such as 'stat'), it takes
several seconds. So we don't treat such files as completion target.
Merge pull request #324 from auto-complete/improve-windows-filename-completion

Fix freeze issue on Windows(#321)
Add autoload cookie to 'ac-config-default'
Merge pull request #325 from auto-complete/add-autoload-cookie

Add autoload cookie to 'ac-config-default'
Update CSS dictionary(#297)
Merge pull request #326 from auto-complete/update-css-dictionary

Update CSS dictionary(#297)