Add jwt crypto module, support unit test for config module

Signed-off-by:  Asai Neko<sugar@sne.moe>

config/env.go

@@ -54,7 +54,7 @@ func SetEnvConf(key string, sub string) {
 
 func EnvInit() {
 	var dict = map[string][]string{
-		"server":   {"address", "debug_mode", "file_logger"},
+		"server":   {"address", "debug_mode", "file_logger", "jwt_secret"},
 		"database": {"type", "host", "name", "username", "password"},
 	}
 	for key, value := range dict {