SeatGeek Instant Answer

Uh, this is my first instant answer! :smile:

**What does your instant answer do?**
It returns all upcoming concerts for a given artist/band.

**What problem does your instant answer solve (Why is it better than organic links)?**
It answers to the user's question a lot quicker than organic links.

**What is the data source for your instant answer? (Provide a link if possible)**
[SeatGeek](https://seatgeek.com/)

**Why did you choose this data source?**
It was suggested on the forum, and @jagtalon said that there used to be an IA using SeatGeek once.

**Are there any other alternative (better) data sources?**
No, I think this one provides all the necessary informations.

**What are some example queries that trigger this instant answer?**
"upcoming concerts weezer", "in flames live shows", "bastille concert", "queens of the stone age live"

**Which communities will this instant answer be especially useful for? (gamers, book lovers, etc)**
People passionate about music, which would love to see their favourite artists/bands live.

**Is this instant answer connected to a DuckDuckHack [instant answer idea](https://duck.co/ideas)?**
[Yes, of course!](https://duck.co/ideas/idea/179/improvement-show-upcoming-concert-for-a-musician)

**Which existing instant answers will this one supersede/overlap with?**
No one.

**Are you having any problems? Do you need our help with anything?**
Just give me your feedback, please :) thank you!

**\*\*Note:** Please attach a screenshot for new instant answer pull requests, and for pull requests which modify the look/design of existing instant answers.
![screen shot 2014-08-01 at 17 00 46](https://cloud.githubusercontent.com/assets/3652195/4102274/3e012526-3122-11e4-94d4-b22a275da6b7.png)
![screen shot 2014-08-01 at 17 01 04](https://cloud.githubusercontent.com/assets/3652195/4102275/4349e432-3122-11e4-9bbf-71649f1b2c76.png)

And one screenshot with acronyms:
![screen shot 2014-08-01 at 17 20 44](https://cloud.githubusercontent.com/assets/3652195/4102282/a9f3187a-3122-11e4-8d9c-86b5d2bb03fd.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)
[x] Tested cross-browser compatibility

    Please let us know which browsers/devices you've tested on:
    - Windows 8
        [] Google Chrome   
        [] Firefox         
        [] Opera           
        [] IE 10           

    - Windows 7
        [x] Google Chrome   
        [x] Firefox         
        [x] Opera           
        [x] IE 8            
        [] IE 9            
        [] IE 10           

    - Windows XP
        [] IE 7            
        [] IE 8            

    - Mac OSX
        [] Google Chrome   
        [] Firefox         
        [] Opera           
        [] Safari          

    - iOS (iPhone)
        [] Safari Mobile   
        [] Google Chrome   
        [] Opera           

    - iOS (iPad)
        [] Safari Mobile   
        [] Google Chrome   
        [] Opera            

    - Android
        [] Firefox         
        [] Native Browser  
        [] Google Chrome   
        [] Opera
```
@MariagraziaAlastra Can you add comments on each section, e.g.,

```perl
...
# Removes whitespace from the query.
$_ =~ s/^\s+|\s+$//g;
...
```