add an integration test using a dockered chrome via selenium

this commit also moves the {Before,After}Suite functions from the
integration_test.go file into the integrationtests_suite_test.go file,
and adds the docker-specific hooks.

ref #162

integrationtests/chrome_test.go

@@ -0,0 +1,16 @@
+package integrationtests
+
+import (
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("Chrome tests", func() {
+	It("loads a simple hello world page using quic", func() {
+		err := wd.Get("https://quic.clemente.io/hello")
+		Expect(err).NotTo(HaveOccurred())
+		source, err := wd.PageSource()
+		Expect(err).NotTo(HaveOccurred())
+		Expect(source).To(ContainSubstring("Hello, World!\n"))
+	})
+})