Display config of Tern/Nodejs server

I'm developping a Java Tern Server which consumes Tern/Nodejs (like your tern.py used in sublime text).
It was hard for me to check taht Tern/nodejs server is configurated as you wish (ex : projectDir, etc).

So I have updated your bin/tern to gives the capability to write conf. With this patch, if your Tern/Node.js server starts on 12345 port and you go at http://localhost:12345/conf with web browser, you will see the conf as JSON. Ex : 

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{
 "projectDir": "D:\\_Projects\\git\\tern.java\\tern.server.nodejs",
 "persistent": false,
 "verbose": false,
 "noPortFile": false,
 "port": 12345,
 "config": {
  "libs": [],
  "loadEagerly": false,
  "plugins": {},
  "ecmaScript": true
 }
}
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