Web.Xml: Remove the dependence to webapi.vim
Web.Xml: Fix a bug that some options are not restored
Web.Xml: Use [:space:] to recognize \n just after a tag name.

https://github.com/mattn/webapi-vim/commit/862fa8205f2ec8d9afb2ed86772b4e3fe6e530ca
Web.Xml: Use upper case letter variable name to use function reference

https://github.com/mattn/webapi-vim/commit/131256a850f14997db75f94d508bba2d978455e1