spec: Add Hocon::ConfigFactory.parse_string test.

Signed-off-by: Wayne <wayne@puppetlabs.com>
Implement Hocon.ConfigFactory.parse_string

Also fixes a number of typos an previously untested code paths.

Signed-off-by: Wayne <wayne@puppetlabs.com>
Merge pull request #4 from waynr/implement-hocon-configfactory-parsestring

Implement hocon configfactory parsestring