Updated README links to Jenkins

[delbonis]

Since we migrated to the new Jenkins system and archived the old ones, the links broke. I also updated the recommended way for Lit to talk to the Bitcoin network, which used to be just pick random peers (--tn3 true) but we usually make it connect to a locally-running node (--tn3 localhost).

[arunasank]

Hi! I pushed a fix for something similar to #444. I wanted to make sure that this works, but when I run this on my system, I get:

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2019/01/22 22:11:13.949962 [INFO] created hardcoded genesis header at /Users/arunasank/.lit/testnet3/header.bin
2019/01/22 22:11:13.949992 [INFO] opened header file /Users/arunasank/.lit/testnet3/header.bin
2019/01/22 22:11:13.950003 [INFO] Attempting connection to node at localhost:18333
2019/01/22 22:11:13.952335 [ERROR]dial tcp4 127.0.0.1:18333: connect: connection refused
2019/01/22 22:11:13.952354 [ERROR] Tried to connect to all available node Addresses. Failed
2019/01/22 22:11:13.952359 [INFO] Couldn't dial node localhost, Moving on
2019/01/22 22:11:13.952365 [ERROR] Can't connect to host localhost
2019/01/22 22:11:13.952369 [ERROR] NewWallit Hook.Start crash  Couldn't establish connection with node. Exiting.
2019/01/22 22:11:13.953296 [INFO] adr 0 hash is <hash>
2019/01/22 22:11:13.953742 [ERROR]Unsupported coin daemon or coin daemon not running
2019/01/22 22:11:13.953756 [ERROR]Unsupported coin daemon or coin daemon not running
2019/01/22 22:11:13.953769 [DEBUG] Trying to listen on %!s(int=2448)
2019/01/22 22:11:13.953778 [DEBUG] eventbus: Published event: lnp2p.listen.start
2019/01/22 22:11:13.953784 [INFO]PORT: 2448
2019/01/22 22:11:13.953955 [INFO] Listening with ln address: <address>
2019/01/22 22:11:13.953985 [INFO] Done, tried 0 hosts
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