First attempt: SaltStack support for Sublime Text

Provides Sublime Text snippets for a variety of stack commands
(including file, pkg, host, network, user and group). Snippets and
syntax highlighting are also provided for Jinja (using code forked from:
https://github.com/jpvanhal/sublime-jinja2).

Preliminary syntax highlighting for SLS files is also provided simply by
calling Sublime Text's built-in YAML support.