Add chefdk

Lots of stuff for making it work with ChefDK 0.1.1, Berkshelf 3, Vagrant 1.6

Full Changelog:
 
 * tool updates
  * add clink for command autocompletion ([#55](https://github.com/tknerr/bills-kitchen/issues/55))
  * remove separate Ruby and Omnibus Chef installations in favor of [Chef-DK](http://www.getchef.com/downloads/chef-dk/windows/)
  * Chef-DK embedded Ruby 2.0.0p451 (x86) [is now the primary Ruby](http://jtimberman.housepub.org/blog/2014/04/30/chefdk-and-ruby/)
  * update to DevKit 4.7.2 (x86), compatible with Chef-DK Ruby 2.x
  * update to Vagrant 1.6.3 and pre-install common plugins (no [bindler](https://github.com/fgrehm/bindler) anymore :-(, see below)
 * vagrant plugin updates:
  * install [vagrant-omnibus](https://github.com/schisamo/vagrant-omnibus) globally (v1.4.1)
  * install [vagrant-berkshelf](https://github.com/berkshelf/vagrant-berkshelf) globally (v2.0.1)
  * install [vagrant-cachier](https://github.com/fgrehm/vagrant-cachier) globally (v0.7.2)
 * enable vagrant-cachier globally via `~/.vagrant.d/Vagrantfile`