Update XSD to conform to style guide

[cjerdonek]

This issue is to finish updating the schema to match our current style guidelines. Per this comment, I believe we're still in code freeze while @demcg works on this. Specifically, attribute and element names need to be updated (which was further clarified by issue #75).

[demcg]

@jungshadow @cjerdonek

I am continuing work on:

Naming Styles

1. Attributes should be camelCased - The first letter of the second and subsequent words are capitalized.
2. Elements should be TitleCased (PascalCased) - The first letter of every word is capitalized.
3. Enumerations should be spinal-case - all lower case with spaces replaced with hyphens.

I will create a PR later today.

[jungshadow]

@demcg How's it coming? Any chance you might have a PR today? If not, just let us know how much longer you need. Also, if you need an additional set of hands, feel free to put up the branch and I can take over.

[jungshadow]

Well...that was timely :)

[demcg]

@jungshadow @cjerdonek
I noticed that we have a number of elements that are suffixed by "Url" that are of type xs:string ... should we change these to xs:anyURI?

created a issue about this. #87

[demcg]

@cjerdonek Can I close this issue?

[cjerdonek]

@demcg Yes, I think so. Thanks! We can always create a new issue if we see other stuff.