climate module docs updated to use tessel.port instead of hardwareapi

Updated Readme and example.js to match guidelines of:

var <module>lib = require(<module>);
var tessel = require('tessel');

var <module> = <module>lib.use(tessel.port['A']);

Updated Readme and example.js to match guidelines of:

var <module>lib = require(<module>);
var tessel = require('tessel');

var <module> = <module>lib.use(tessel.port['A']);