If you don't want to install GBWhatsapp, another alternative would be to install the app Parallel Space.
Using this app, you can run two instances of any app installed in your phone, like WhatsApp, Facebook,etc. Both the apps will work independently. So that means two accounts of WhatsApp, Hike, and even Snapchat.
The best thing about it is that you do not have to root your phone.
You can use this link to download parallel space