chore(project): 添加项目配置文件和忽略规则

- 添加 Babel 配置文件支持 ES6+ 语法转换
- 添加 ESLint 忽略规则和配置文件
- 添加 Git 忽略规则文件
- 添加 Travis CI 配置文件
- 添加 1.4.2 版本变更日志文件
- 添加 Helm 图表辅助模板文件
- 添加 Helm 忽略规则文件

script/logstash/config/logstash-kafka.conf

@@ -0,0 +1,17 @@
+# App(Logback KafkaAppender) -> Kafka -> Logstash -> Elasticsearch pipeline.
+
+input {
+	kafka {
+		bootstrap_servers => "localhost:9092"
+		topics => ["logback_to_logstash"]
+	}
+}
+
+output{
+	elasticsearch {
+		hosts => ["localhost:9200"]
+	}
+	stdout {
+		codec => rubydebug
+	}
+}

script/logstash/config/logstash-logback.conf

@@ -0,0 +1,19 @@
+# App(Logback LogstashTcpSocketAppender) -> Logstash -> Elasticsearch pipeline.
+
+input {
+	# Using TCP protocol
+	tcp {
+		port => 4560
+		# execute command `./logstash-plugin install logstash-codec-json_lines` to install this plugin.
+		codec => json_lines
+	}
+}
+
+output{
+	elasticsearch {
+		hosts => ["localhost:9200"]
+	}
+	stdout {
+		codec => rubydebug
+	}
+}