Create retext plugin: Abbreviations and acronyms

[danielgolden]

I could really use a list of acronyms for New Relic.

Requirements

When a user breaks one of these rules, provide feedback (See one core docs):

Basics

• If you’re unsure whether your audience will understand an acronym or abbreviation, spell out the words followed by the acronym in parentheses the first time it’s used in text. You can use the acronym only from then on.
• Wherever possible, spell out common words, like "average," instead of abbreviating them.
• Don't use apostrophes to make acronyms plural (ABC's -> ABCs)