change "train classifier" button
change "train classifier" button

https://github.ibm.com/Watson/developer-experience/issues/86

Updated Train button to be full-width (checkbox).

watson-developer-cloud/visual-recognition-nodejs,oremari/plantDiseaseSymptoms-vr-demo-1483744992341,oremari/plantDiseaseSymptoms-vr-demo-1483744992341,watson-developer-cloud/visual-recognition-nodejs