ParticleAsset & ParticleAssetEmitter.getSelectedField now returns a string representing the name of the selected field, as per original design.
Changed TamlWrite so that Data Keys are written out as children of the ParticleAssetEmitter's Fields, as originally designed.
Merge pull request #85 from capnlove/ParticleAssetCreation_Fix

ParticleAsset.getSelectedField now returns a string.
ParticleAssetEmitter.getSelectedField now returns a string.
Particle asset writes to TAML correctly