Reworked all identifier quoting detections

Otherwise, trying to manage `debian-sys-maint` will fail miserably, quoted or not.

Fixes #609
Remove mime-types from .sync.yml

Gemfile no longer needs mime-types so it does not need to be
modulesynced separately.
Merge pull request #618 from cmurphy/sync

Remove mime-types from .sync.yml
Update .travis.yml, Gemfile, Rakefile, and CONTRIBUTING.md
Add json gem

The puppet_facts gem implicitly depends on the json gem.
On Ruby 1.8.7, json is not built in. On Puppet 2.7, it is
not explicitly pulled in by the hiera gem. So we add it
here explicitly.
Merge pull request #619 from cmurphy/master

Update .travis.yml, Gemfile, Rakefile, and CONTRIBUTING.md
Merge pull request #612 from lavoiesl/identifier-quoting

Reworked all identifier quoting detections