remove quotes from integers values on JSON statistics (being possible to use tools like InfluxData Telegraf)

add autoReconnect configuration to allow disable the automatic reconnect on javascript client when a failure happens

fix error handler for WebSocket connections to call onerror with proper event type. closes #213 and closes #214 issues

Fix #183 avoiding that the html tags inside the javascript being understood as part of the html page

send alert messages to an events channel when a channel is created or destroyed and when a client subscribe or unsubscribe a channel

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