fix[litemall-wx-api,litemall-admin-api]: 采用spring-security的BCryptPasswordEncoder来对用户和管理员密码加密。目前存在问题是，两个模块使用了两次代码。之后可能会实现一个新的litemall-util模块来存放通用类。

litemall-admin-api/src/test/java/org/linlinjava/litemall/admin/BcryptTest.java

@@ -0,0 +1,25 @@
+package org.linlinjava.litemall.admin;
+
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.linlinjava.litemall.admin.util.bcrypt.BCryptPasswordEncoder;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@SpringBootTest
+public class BcryptTest {
+
+    @Test
+    public void test() {
+        String rawPassword = "aaaaaa";
+        String encodedPassword ="";
+        BCryptPasswordEncoder bCryptPasswordEncoder =  new BCryptPasswordEncoder();
+        encodedPassword = bCryptPasswordEncoder.encode(rawPassword);
+
+        System.out.println("rawPassword=" + rawPassword + " encodedPassword=" + encodedPassword);
+
+        Assert.assertTrue(bCryptPasswordEncoder.matches(rawPassword, encodedPassword));
+    }
+}