v1.0.0-rc.6

• Add support for YAML 1.0 and YAML 1.1, renaming extended schema as yaml-1.1 (note: YAML 1.0 prefix tags are parsed and stringified, but are not resolved)
• Refactor the API a bit again, adding parseDocument & renaming parseDocuments as parseAllDocuments. This more closely matches the naming pattern used by other libraries.
• Add type and format to content nodes, allowing for stringification control.
• Add keepBlobsInJSON and keepNodeTypes options, both defaulting to true.
• Split default options in YAML.defaultOptions and YAML.Document.defaults, depending on YAML version dependence
• Update to latest yaml-test-suite (now only four tests are broken in the upstream repo: yaml/yaml-test-suite#25, yaml/yaml-test-suite#27, yaml/yaml-test-suite#38, yaml/yaml-test-suite#39)
• Various minor bugfixes