basic set of tests for shape-outside + shape-box
removed tests 001 & 005. since shape-outside: margin-box on a plain div float has the same effect as if no shape-outside property was set, it's not testable.  margin-box tests are covered elsewhere with polygons, circles, and images.
Merge pull request #547 from rhauck/shape-box-tests

basic set of tests for shape-outside + shape-box