rename site-build to openseadragon-site-build for clarity

[macarthy]

Can we rename site-build to openseadragon-site-build for clarity ?

Its a small thing but better.

[iangilman]

Hmm...I'll give it some thought. I kind of like not having everything prefixed with openseadragon. I realize the concept of this repository is a little confusing. I'm not sure changing the name would help all that much though.

[pearcetm]

When it's within the openseadragon organization/user heading, having it named site-build makes sense. When I forked it just now, I renamed it openseadragon-site-build for clarity within my own repositories. And that was before I saw this issue :)

[iangilman]

Good point!