On the web you can find a lot of solutions for this, on my last project when I was working on a website based on SharePoint 2013 (http://www.motion10.nl). I found a great extension for Visual Studio called: Web Essentials.
Key features of this extension are:
- Minimize files.
The extension does much more for example it also display’s a color swatch next to a specified color in you Stylesheet file .
For a complete list off the features you can look on the website of Web Essentials.
All of the settings of the extension can be managed from the default options menu within the “Web Essentials” category that the extension adds.
In my opinion this extension should be added to the list of items you install on a development environment.