Add utility class for word-wrap/word-break

Created by: 0xadri

Relevant pull request: https://github.com/twbs/bootstrap/pull/19316

Very long words can break out of its containing tag.

One can force these long words to break to the next line(s) if necessary.

See an example on https://jsfiddle.net/AdrienBe/n16vqz5p/

Resources: http://css-tricks.com/snippets/css/prevent-long-urls-from-breaking-out-of-container/ http://stackoverflow.com/questions/320184/how-to-prevent-long-words-from-breaking-my-div http://caniuse.com/#search=word-wrap http://stackoverflow.com/a/22811590/759452 http://developer.mozilla.org/en-US/docs/Web/CSS/word-wrap