Fixed writeCommands order

Previously command order was not maintained which would cause issues when commands were order dependant! This was also causing tests to occasionally fail ;)

Fixed Issue: Cannot create sequence

This fixes the issue raised in https://github.com/mikefarah/yaml/issues/8.

Create new Yaml files on the fly

Added a 'new' command that largely works like update, but without an existing yaml file.

Ability to create new YAML entries

This fixes the issue raised in https://github.com/mikefarah/yaml/issues/7

Maintain key order

Key order is now maintained when reading and writing YAML files, previously they were being alphabetically sorted.

Fixed write array problem

This fixes the bug raised in Issue 3, that is updating a yaml array.

Handle 'index out of range' errors gracefully

Includes fix for issue #1

JSON conversion

You can now convert to and from json

Write command bug fix

This fixes a bug when using the write command without a script file

Write scripts

Can now give the write command a update script to apply to a yaml file