remove 'superagent' dependency, use node https. fixes getgauge#1719

Signed-off-by: sriv <srikanth.ddit@gmail.com>

build/npm/package.json

@@ -29,7 +29,6 @@
     "sinon": "^6.2.0"
   },
   "dependencies": {
-    "superagent": "^5.2.2",
     "unzipper": "^0.9.3"
   }
 }

build/npm/src/index.js

@@ -5,25 +5,33 @@
 const install = require("./install"),
     path = require("path"),
     unzip = require('unzipper'),
-    request = require('superagent'),
+    https = require('https'),
     packageJsonPath = path.join(__dirname, "..", "package.json"),
     binPath = "./bin";
 
+var downloadFollowingRedirect = function(url, resolve, reject) {
+    https.get(url, { headers: { 'accept-encoding': 'gzip,deflate' } }, res => {
+        if (res.statusCode >= 300 && res.statusCode < 400) {
+            downloadFollowingRedirect(res.headers.location, reject, resolve);
+        } else {
+            res.pipe(unzip.Extract({ path: path.normalize(binPath) })).on('error', reject).on('end', resolve);
+        }
+    });
+};
 
 var downloadAndExtract = function(version) {
     console.log(`Fetching download url for Gauge version ${version}`);
     let url = install.getBinaryUrl(version);
     console.log(`Downloading ${url} to ${binPath}`);
     return new Promise((resolve, reject) => {
         try {
-            request.get(url).pipe(unzip.Extract({ path: path.normalize(binPath) }));
-            resolve();
+            downloadFollowingRedirect(url, resolve, reject);
         } catch (error) {
             reject(error);
         }
     })
-}
+};
 
 install.getVersion(packageJsonPath)
-.then((v) => downloadAndExtract(v.split('-')[0]))
-.catch((e) => console.error(e));
+    .then((v) => downloadAndExtract(v.split('-')[0]))
+    .catch((e) => console.error(e));