5 catch phrases that are revolutionizing industry productivity

Summary:
Add titles and captions to the image widget.

Also change the css classNames from

    "perseus-image-widget" for the widget and
    "perseus-widget-image" for the editor

to

    "perseus-image-widget" for the widget and
    "perseus-image-editor" for the editor

Test Plan:
Add a title and a caption to the image:
[sample item](http://localhost:9000/test.html#content=%7B%22question%22%3A%7B%22content%22%3A%22%5B%5B%E2%98%83%20image%202%5D%5D%22%2C%22images%22%3A%7B%22https%3A%2F%2Fka-perseus-graphie.s3.amazonaws.com%2Fda8df81c78b22f5c69d477d8eabfb583968eaf84.png%22%3A%7B%22width%22%3A400%2C%22height%22%3A70%7D%2C%22https%3A%2F%2Fka-perseus-graphie.s3.amazonaws.com%2Fb59fc02ca1aae800977b8793ed22f647a1aa75ee.png%22%3A%7B%22width%22%3A425%2C%22height%22%3A150%7D%7D%2C%22widgets%22%3A%7B%22image%202%22%3A%7B%22type%22%3A%22image%22%2C%22graded%22%3Atrue%2C%22options%22%3A%7B%22range%22%3A%5B%5B0%2C10%5D%2C%5B0%2C10%5D%5D%2C%22box%22%3A%5B483%2C244%5D%2C%22backgroundImage%22%3A%7B%22url%22%3A%22https%3A%2F%2Fka-perseus-images.s3.amazonaws.com%2F2e21c4e47e946e0c7120fa2a94ade03c28ec3fb7.png%22%2C%22width%22%3A483%2C%22height%22%3A244%7D%2C%22labels%22%3A%5B%5D%2C%22title%22%3A%22Urban%20and%20Regional%20Planners%20%20%5CnPercent%20Increase%20in%20Employment%2C%20Projected%202010-2020%22%2C%22caption%22%3A%22Adapted%20from%20United%20States%20Bureau%20of%20Labor%20Statistics%2C%20Employment%20%5CnProjections%20Program.%20%E2%80%9CAll%20occupations%E2%80%9D%20includes%20all%20occupations%20in%20the%20%5CnUnited%20States%20economy.%22%7D%2C%22version%22%3A%7B%22major%22%3A0%2C%22minor%22%3A0%7D%7D%7D%7D%2C%22answerArea%22%3A%7B%22type%22%3A%22multiple%22%2C%22options%22%3A%7B%22content%22%3A%22%22%2C%22images%22%3A%7B%7D%2C%22widgets%22%3A%7B%7D%7D%2C%22calculator%22%3Afalse%7D%2C%22itemDataVersion%22%3A%7B%22major%22%3A0%2C%22minor%22%3A1%7D%2C%22hints%22%3A%5B%5D%7D)
I reloaded this item to test that those props got saved in the json

Auditors: michelle