Remove support for EOL'd ubuntu-13.10 (saucy)

Saucy reached its EOL on 7/17/14.

https://lists.ubuntu.com/archives/ubuntu-announce/2014-June/000185.html
Make `brew_is_upgradable` mac function more robust

Rely on logic of `brew outdated` to decide whether a brew is upgradable.

Fixes #276 and #282:
* https://github.com/thoughtbot/laptop/issues/276
* https://github.com/thoughtbot/laptop/issues/282
Removed unused linux-components and customized things a bit.
More customizations.
Add more cask applications and other fluff.
Merge branch 'personal' of github.com:gtramontina/laptop into personal

Conflicts:
	common-components/ruby-environment
	common-components/zsh
	mac-components/packages
	mac-components/rbenv
Install sublime package control and prevent .DS_Store files from being created.