Decompress and load multiple .gz files from multiple folders

I was able to decompress a single .gz file with a single csv in it by following Chris Webb's blog.

Ive also seen these blogs but was not able to successfully load and decompress files:

http://sql10.blogspot.sg/2016/06/reading-zip-files-in-powerquery-m.html
http://www.excelandpowerbi.com/?p=155

basically, my folder structure is like this

Parent_folder

• Folder_A
  • Folder_A_1
    
    • file.gz
  • Folder_A_2
    • file.gz