Puppet lint check for numeric named variables

The future parser disallows numeric variables, so let's check them before we upgrade

Name		Name	Last commit message	Last commit date
Latest commit History 8 Commits
lib/puppet-lint/plugins		lib/puppet-lint/plugins
spec		spec
.gitignore		.gitignore
.travis.yml		.travis.yml
Gemfile		Gemfile
LICENSE		LICENSE
README.md		README.md
Rakefile		Rakefile
puppet-lint-numeric_variable.gemspec		puppet-lint-numeric_variable.gemspec

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