Add compression

Related: simcaq/SCRUM#477

package.json

@@ -20,6 +20,7 @@
     "chai": "^3.5.0",
     "chai-http": "^3.0.0",
     "chalk": "^1.1.3",
+    "compression": "^1.7.3",
     "cookie-parser": "^1.3.5",
     "cors": "^2.7.1",
     "csv-express": "^1.1.0",

src/libs/app.js

@@ -4,6 +4,7 @@ const bodyParser = require('body-parser');
 const methodOverride = require('method-override');
 const cors = require('cors');
 const squel = require('squel');
+const compression = require('compression');
 
 const libs = `${process.cwd()}/libs`;
 
@@ -25,6 +26,7 @@ const db = mongoose();
 
 require(`${libs}/middlewares/passport`);
 
+app.use(compression({level: 6}));
 app.use(bodyParser.json({limit: '50mb'}));
 app.use(bodyParser.urlencoded({ extended: true, limit: '50mb' }));
 app.use(cookieParser());