Improve yaml backend library

[webknjaz]

• https://pypi.python.org/pypi/rtyaml https://github.com/unitedstates/rtyaml
  rtyaml: Round-trippable YAML
  All the annoying stuff we had to do to make YAML usable.
  This module provides wrappers around pyyaml to set sane defaults:
  • round-tripping YAML files is possible by preserving field order
  • saner output defaults are set for strings
  • a comment block found at the very beginning of a stream when loading YAML is preserved when writing it back out
• https://pypi.python.org/pypi/pykwalify/ https://github.com/grokzen/pykwalify
  YAML/JSON validation library with schema, like trafaret.
  pip install 'pykwalify[ruamel]' for ruamel backend
• https://pypi.python.org/pypi/layered-yaml-attrdict-config/ https://github.com/mk-fg/layered-yaml-attrdict-config
  Simple YAML-based configuration module, does what it says in the name.
  Alternate implementations list: https://github.com/mk-fg/layered-yaml-attrdict-config#links
• https://pypi.python.org/pypi/ruamel.yaml/ https://bitbucket.org/ruamel/yaml
  YAML 1.2 loader/dumper package for Python.
  ruamel.yaml supports YAML 1.2 and has round-trip loaders and dumpers that preserves, among others:
  • comments
  • block style and key ordering are kept, so you can diff the round-tripped source
  • flow style sequences ( ‘a: b, c, d’) (based on request and test by Anthony Sottile)
  • anchor names that are hand-crafted (i.e. not of the formidNNN)
  • merges in dictionaries are preserved

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