(re)Add compression

package.json

@@ -13,6 +13,7 @@
     "body-parser": "^1.13.1",
     "chai": "^3.5.0",
     "chai-http": "^3.0.0",
+    "compression": "^1.6.2",
     "cookie-parser": "^1.3.5",
     "cors": "^2.7.1",
     "csv-express": "^1.1.0",

src/libs/app.js

@@ -3,6 +3,7 @@ const cookieParser = require('cookie-parser');
 const bodyParser = require('body-parser');
 const methodOverride = require('method-override');
 const cors = require('cors');
+const compression = require('compression');
 
 const log = require('./log')(module);
 
@@ -19,6 +20,7 @@ app.use(cookieParser());
 app.use(cors());
 app.use(methodOverride());
 app.use(cache('1 day'));
+app.use(compression(9));
 app.use(api);
 
 // catch 404 and forward to error handler