Change mkdir to mkdir -p in scripts

[meirbon]

Self explanatory, but might be a nice little addition. I tend to create a public folder in the folder from which the website will be served. It looks like this:

- my-website
    - my-application
    - public
        - index.php (starts application from ../my-application)

So both the 'my-website' and public folder have to be created, which makes mkdir -p necessary.