Refactorization and add metrics system.

src/main/java/org/codiki/account/AccountController.java

@@ -46,8 +46,16 @@ public class AccountController {
 
 	@JsonView(View.UserDTO.class)
 	@PostMapping("/login")
-	public User login(@RequestBody final User pUser) throws BadCredentialsException {
-		return accountService.authenticate(pUser);
+	public User login(@RequestBody final User pUser, HttpServletResponse pResponse) throws BadCredentialsException {
+		User result = null;
+
+		try {
+			result = accountService.authenticate(pUser);
+		} catch(BadCredentialsException ex) {
+			pResponse.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
+		}
+
+		return result;
 	}
 	
 	@GetMapping("/logout")