added blog example

examples/blog/database/database.go

@@ -0,0 +1,20 @@
+package database
+
+import "gopkg.in/mgo.v2"
+
+type Database struct {
+	Session *mgo.Session
+}
+
+func New(uri string) *Database {
+	session, err := mgo.Dial(uri)
+	if err != nil {
+		panic(err)
+	}
+
+	session.SetMode(mgo.Monotonic, true)
+
+	return &Database{
+		Session: session,
+	}
+}