shape ops work in progress
add quartic solution for intersecting quadratics

git-svn-id: http://skia.googlecode.com/svn/trunk@5541 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/experimental/Intersection/QuarticRoot.h b/experimental/Intersection/QuarticRoot.h
new file mode 100644
index 0000000..8baa842
--- /dev/null
+++ b/experimental/Intersection/QuarticRoot.h
@@ -0,0 +1,2 @@
+int quarticRoots(const double A, const double B, const double C, const double D,
+        const double E, double s[4]);