Switch to homebrew cask instead of mac_pkg module

- add homebrew-extras to install caskroom.io
- clean intellij idea stuff and install via homebrew cask
Add tags to master.yml
Vagrant: Try to switch to homebrew setup

Note that this is temporary, because I'm not quite happy with this solution:

- homebrew case might prompt for root password
- homebrew can only install a single version (except if some older
  versions are published in another tap repository)
Add homebrew/versions tap
Start to convert into single playbook with conditional includes
Convert vagrant, virtualbox and intellij_idea to new style
Add more ansible tags and rename homebrew-/_extras
Add a basic script to kick ansible-playbook

requires battleschool installed for the mac_pkg module
Fix "cask" vagrant and add support of plugin installation
Fix and improve git setup

- fix wrong "when" condition
- add bash completion
Add forgotten home.yml
Don't upgrade all homebrew stuff by default
Add Node.js and SourceTree