add smtp, finish redis and register(with invitation code and verification code)

Change-Id: Ie8e07fe058b9d970a00424d463ce30d4ec72086a
diff --git a/pom.xml b/pom.xml
index 7bf796e..9238ad6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -96,6 +96,10 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-data-redis</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-mail</artifactId>
+        </dependency>
     </dependencies>
 
     <build>