Use OrderedMap to maintain YML input file props order.

[tomger]

In our token setup the order of the YML props has a meaning. e.g. colors are grouped by hue.

As far as I can tell without this patch the order of the output is nondeterministic/scrambled. This is because Immutable.fromJS, at least in our case, converts the input JS array into a non-ordered Map instead of an OrderedMap.

Example.yml

• colorYellow
• colorDarkYellow
• colorGreen

Example.output (without patch)

• $yellow
• $green
• $darkYellow

Example.output (with patch)

• $yellow
• $darkYellow
• $green

[KITSStuCoe]

@tomger, the failing test just needs a done() in the r func:

lib/tests/effects.js, line 103.

r => { done(); }

worked for me, anyway.