Add braces to meet WordPress code standards
Reduce the new site form back to one input field for domain/path

We'll automatically determine intent from this.
Add placeholder text for the new site domain and path entry
Make the move to using site address rather than domain
Introduce free-form site domain and path addition

Rather than restricting to subdomains and paths, we should allow
new sites to be created with a full site and path.

http://college.wsu.edu/first/ will create a site with a domain of
college.wsu.edu and a path of first/

We have some basic restrictions to start with and can start
expanding form there.

This is the first in a series of commits to enhance this.
Add wsu to the restricted subdirectory name list
Use the final $path and $domain variables for site creation

These have been through all processing necessary for final comparison
and site creation.
s/domain/address/
Look for an existing site address before adding
We really only support one path segment at this time
Merge pull request #61 from washingtonstateuniversity/new-site

[PR] Support arbitrary domain/path when adding sites to a network