Don't style all abbr's as initialism

Created by: jacobrask

Abbreviations with title attributes are commonly used in for instance table headers if a word does not fit, then you would not want it to be uppercased.

Also only show help styling for abbr's with a title attribute present.

Read more:

• http://developers.whatwg.org/text-level-semantics.html#the-abbr-element
• http://en.wikipedia.org/wiki/Abbreviation
• http://en.wikipedia.org/wiki/Initialism