Add support for http_proxy

Suggested addition to collect.js:

// ADDED PROXY CONFIGURATION
if (process.env.http_proxy) {
console.log('INFO: Setting proxy to [' + process.env.http_proxy + '] from the environment variable http_proxy...');
var proxy = require('proxy-agent');
AWS.config.update({
httpOptions: { agent: proxy(process.env.http_proxy) }
});
}

Start with collect.js and review how AWS.config is initialized. Compare the suggested http_proxy handling with the project's dependency setup, then verify that the environment variable configures the proxy when present and leaves normal behavior unchanged when absent.

Written by the indexing model from the issue text.