add 4th send return mode: Old Observable mode AND option auto connect code

[Lyoko-Jeremie]

1.add 4th send return mode: Old Observable mode this mode will return a Observable and next it when send this mode useful when someone use flatMap function in Rxjs.

2.option auto connect code use mustReconnectCloseStatusCodeListandnotReconnectCloseStatusCodeListto config when to reconnect

3.default close mode is close(false) so, you can simple write close()to close it

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I dont test the code. because my test evironment broken, this lib cannot create any connect, only by a reboot on my computer. (+_+)
now I lost my test evironment. So, this PR need complete test before merge.

[afrad]

We need someone to test the code.