HaveJsonFields matcher
accept symbols as field names
rename variable
support cucumber have_json_keys matcher; improve tests; fix bug with table.rows
fix check logic
support arbitrary json keys
Merge branch 'master' of https://github.com/AlexanderPavlenko/json_spec into have_json_fields
Adds support for have_json_fields
Merge branch 'have_json_fields'
Merge branch 'nested_json_comparison'