Add Debian 7.0 (Wheezy)
Use latest platform versions by default

Remove all the default.json files and thus default to the newest (well,
based on filename sorting) version if `:version` option is not
specified. If the filename sorting is not valid with some platform in
the future, a default.json can be then added for that platform.

The whole feature is undocumented and users are encouraged to always
declare the specific version anyway.
Merge pull request #24 from tmatilai/add_debian_7_0

Add Debian 7.0 (Wheezy)
Remove default.json searching logic
Merge pull request #25 from tmatilai/use_latest_versions_by_default

Use latest platform versions by default
Require platform version option

Maintain compatibility with ChefSpec, but otherwise always require
`platform` and `version` options (or `path`).

Continuation for cleanup in #25.
Remove dead code in #platform_path

The exception was never raised as there was a `File.exists?` missing.
But after #7 we anyway want to look for the Github repo before throwing
the exception. But improve the error message to include the platform.
Merge pull request #26 from tmatilai/require_platform_version

Require platform version option
Cleanup a tid bit
fix syntax, space after method calls?
Merge pull request #27 from ranjib/fix_syntax

fix syntax, space after method calls?
1.0 release