fixes #1313

[svnserve](http://svnbook.red-bean.com/en/1.7/svn.serverconfig.svnserve.html) is a lightweight custom TCP/IP protocol for SVN.
although the majority of SVN hosts historically provide HTTP or SSH based hosting, this is also a viable option

The svnResolver, used to filter out the `svn://` prefix and default to `http://`, this prevented svnserve from working with Bower.

This is a breaking change to anybody who stored their dependancy as `svn://xxx` instead they now how to be specific in declaring prefixes as: `svn+http(s)://` as applicable