OS X / Darwin fixes

* Add creates for installation of homebrew and homebrew cask
* Update list of OS X applications to install
* Add temporary list of OS X defaults to write
* Use curl instead of wget for lein as wget is not in the base OS X
  installation
* Increase brew cask timeout to 3600 to avoid timeouts for big
  packages
* Correct require for installation packages, forgot to require brew
  and brew cask before actually using them.