Handle events

- Adds interfaces for developers to build handlers that update data in
response to log events
- Resolves #29

libraries/shared/shared_suite_test.go

@@ -0,0 +1,13 @@
+package shared_test
+
+import (
+	"testing"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+func TestShared(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Shared Suite")
+}