Add PeopleInSpace

# Spice Pull Request

**What does your instant answer do?**
Shows the number of people currently in space, and lists their names, titles, and links to biographies.


**What problem does your instant answer solve (Why is it better than organic links)?**
It shows information that would not be available without following a link.


**What is the data source for your instant answer? (Provide a link if possible)**
http://howmanypeopleareinspacerightnow.com/space.json


**Why did you choose this data source?**
It is extremely relevant and appears to be reliable.


**Are there any other alternative (better) data sources?**
None known


**What are some example queries that trigger this instant answer?**
``number of people in space``, ``people in orbit right now``


**Which communities will this instant answer be especially useful for? (gamers, book lovers, etc)**
People interested in space


**Is this instant answer connected to a DuckDuckHack [instant answer idea](https://duck.co/ideas)?**
https://duck.co/ideas/idea/313/how-many-people-are-in-space-now


**Which existing instant answers will this one supersede/overlap with?**
None known


**Are you having any problems? Do you need our help with anything?**
A regexp trigger could respond to a wider variety of natural language questions, but I'm not sure it's worth the expense for an instant answer like this one with very narrow applicability.

**Screenshot**
![2014-06-24-20 18 31_1680x1050](https://cloud.githubusercontent.com/assets/7873686/3380226/316ecab2-fc01-11e3-8911-30db488ae6b4.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://github.com/duckduckgo/duckduckgo-documentation/blob/master/duckduckhack/styleguides/design_styleguide.md)
[*] Tested cross-browser compatability

    Please let us know which browsers/devices you've tested on:
    - GNU/Linux
        [X] Google Chrome   
        [X] Firefox         
        [X] Opera           
```
@elebow Could you change this to return the singular if there is only one person in space?  Something like `(api_result.number = 1 ? 'Person' : 'People')` should work.