Add support for custom docker-compose.yml
Add support for custom docker-compose.yml

For some reason, one may want/need to edit laradock's default file `docker-compose.yml` e.g. srtipping out uneeded services, so that the whole project can be brought up with a simple `docker-compose up` command. With this commit, the user can copy default `docker-compose.yml` as `docker-compose.custom.yml` and make the desired changes there. This file will not be tracked by Git.
bestlong/laradock,bestlong/laradock,jinnawat/laradock,bestlong/laradock,hnquang112/laradock,hnquang112/laradock,bestlong/laradock,LaraDock/laradock,hnquang112/laradock,jinnawat/laradock,jinnawat/laradock,jinnawat/laradock,bestlong/laradock,hnquang112/laradock