[Remix] Extension for dog leash 'Flexi'

** Update 9/13/2018 **
I printed the original version and found that the bag hole was in the wrong spot. I moved it over and it should be in the correct spot now

This is a remix of [thing:1941323](https://www.thingiverse.com/thing:1941323)

I added a hole for the bags in the dispenser. Should print the same way as the original with minimal supports.