title: Github merge multiple files into single compressed master file
body: <p>One of our sites has a bunch of separate CSS files &amp; JS files being called and I want to optimise it all into a single CSS &amp; a single JS file. </p>
  
  <p>Someone mentioned you can setup Github to do this by having your files separate in GitHub repositories and it will build a new single master file that has all the code compressed and updating any of the single files will update the master file. </p>
  
  <p>This might sound easy to people who use Github but I've only used Github for storing code and pieces in the past and never really done much else with it. I've tried looking for information on this and I've found stuff about merging repositories/branches but it doesn't seem to do all of what we wanted.</p>
  
  <p>Can someone help with what I need to do? or point me in the direction of a guide for setting up and doing what we need described above? Alternatively is there something that can do this outside of Github?</p>
  
  <p>Thanks
  Michael</p>