Wrapping input text

[tdurnford]

Fixes #17
Fixes #124

Added textarea input as a style option per issues #17 and #124.

const styleSet = createStyleSet({
    sendBoxTextWrap: true
});

[coveralls]

Coverage increased (+1.3%) to 54.065% when pulling 302fa76 on tdurnford:17 into eaa3f61 on Microsoft:master.

[corinagum]

You can take a look at failing tests here: https://webchattest.blob.core.windows.net/travis-result/2019/04/10/s64hm/index.html
https://travis-ci.org/Microsoft/BotFramework-WebChat/builds/518536828?utm_source=github_status&utm_medium=notification

[justinwilaby]

LGTM

[cwhitten]

thanks for the contribution @tdurnford ! this is good stuff

[EdwinOtten]

Thanks @tdurnford! Also nice that it is an optional feature 👍

[babupca]

@tdurnford , Is sendBoxTextWrap fix released, We are using the webchat, where require the inputted text to be wrapped, which has not happened. Kindly suggest to us which version of WebChat do need to use to get this issue fixed.