site:deploy unable to utilize UNC paths

Currently under windows, a UNC path (even one represented as a file:// URL) cannot be written to. There seems to be something in the guts of Ant and Maven that doesn't understand how to treat UNC paths as valid paths.

In an effort to avoid the "wontfix" status: mapping the UNC path as a network drive is effective but terribly kludgey as a long-term solution. Different developers in an organization may have drives already mapped to something else. Given a vanilla Windows network, UNC paths may be the best choice for deploying sites.

Leaving this as a minor bug since it mainly affects internal projects of an organization, but it is an important one as it can keep folks from adopting Maven for use in corporate environments.