TwelveOclock: add new instant answer to help with 12 am/pm

**What does your instant answer do?**

Helps people remember whether 12pm/am is noon or midnight.

**What problem does your instant answer solve (Why is it better than organic links)?**

Organic links don't come up with quick definitive answers without more clicks and reading.

**What is the data source for your instant answer? (Provide a link if possible)**

Developer knowledge of how AM and PM work.  No external sources used.

**Why did you choose this data source?**

I trust myself!

**Are there any other alternative (better) data sources?**

Possibly, but it didn't seem worth tracking one down.

**What are some example queries that trigger this instant answer?**

"is 12:00pm midnight?" "is 12am noon"

**Which communities will this instant answer be especially useful for? (gamers, book lovers, etc)**

People who use 24 hour clocks and are confused about midnight and noon on a 12 hour clock.

**Is this instant answer connected to a DuckDuckHack [instant answer idea](https://duck.co/ideas)?**

[Yes.](https://duck.co/ideas/idea/4485/give-an-answer-is-12-pm-noon)

**Which existing instant answers will this one supercede/overlap with?**

None, to my knowledge.

**Are you having any problems? Do you need our help with anything?**

Nothing I can't handle so far.

**\*\*Note:** Please attach a screenshot for new instant answer pull requests, and for pull requests which modify the look/design of existing instant answers.

![screenshot from 2014-09-16 09 10 43](https://cloud.githubusercontent.com/assets/6280000/4287491/1a7c8a2c-3da3-11e4-8f38-353cee901946.png)



## Checklist
Please place an 'X' where appropriate.

```
[X] Added metadata and attribution information
[X] Wrote test file and added to t/ directory
[X] Verified that instant answer adheres to design guidelines (https://duck.co/duckduckhack/design_styleguide)
[X] Verified that instant answer adheres to code styleguide (https://duck.co/duckduckhack/code_styleguide)
[] Tested cross-browser compatibility
```