Download BrowserStackLocal binary over HTTPS

Closes #142

Author: shirish87

lib/local.js

@@ -2,7 +2,7 @@ var Log = require('./logger'),
   logger = new Log(global.logLevel),
   exec = require('child_process').execFile,
   fs = require('fs'),
-  http = require('http'),
+  https = require('https'),
   windows = ((process.platform.match(/win32/) || process.platform.match(/win64/)) !== null),
   localBinary = __dirname + '/BrowserStackLocal' + (windows ? '.exe' : ''),
   utils = require('./utils'),
@@ -97,7 +97,7 @@ var Tunnel = function Tunnel(key, port, uniqueIdentifier, callback) {
     logger.debug('Downloading BrowserStack Local to "%s"', localBinary);
 
     var file = fs.createWriteStream(localBinary);
-    http.get((windows ? 'http://s3.amazonaws.com/browserStack/browserstack-local/BrowserStackLocal.exe' : ('http://s3.amazonaws.com/browserStack/browserstack-local/BrowserStackLocal-' + process.platform + '-' + process.arch)),
+    https.get('https://s3.amazonaws.com/browserStack/browserstack-local/BrowserStackLocal' + (windows ? '.exe' : '-' + process.platform + '-' + process.arch),
     function(response) {
       response.pipe(file);