Nice tutorial! But it doesnt work for non-rooted devices, and i dont wanna root my phone (warranty).
So i have a workaround for it!
Step 1: Download the package from the OP
Step 2: Extract it and put it in your device.
Step 3: Browse to the place where you put the files with a file explorer that can install apk's, i use ES File Explorer.
Step 4: Install them (or one of them)
Step 5: Verify it works
Step 6: Go to Settings>Apps
Step 7: Search the Motorola Camera.
Step 8: Disable it.
Step 9: Do the same for the Gallery
Step 10: Replace all your old shortcuts with the new ones.
Known Bugs with this method: Panorama FC, Editing FC.
For replacing AOSP with Motorola apps, you need to uninstall the Camera and Gallery from google, then go to Settings>App>Disabled and Enable the MotoCam and MotoGallery
If you want screenshots, ask me.