Displays error when uploading corrupt image (#110)
Displays error when uploading corrupt image (#110)

* Displays error when uploading corrupt image

Also displays an error when uploading a file
that is not an image.  Fixes 100 and 102.

* fix linting errors

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