Hindu / Vedic calendar Panchangam Instant Answer (Goodie)

**What does your instant answer do?**
It provides the hindu calendar called [Panchangam](https://en.wikipedia.org/wiki/Panchangam) for a particular day and defaults to today.

**What problem does your instant answer solve (Why is it better than organic links)?**
It is better than organic links when you quickly want to verify the hindu calendar details of a particular day
and not have to deal with clunky date widgets / select dropdowns.

**What is the data source for your instant answer? (Provide a link if possible)**
Date::Indian perl module is used to calculate the answer

**Why did you choose this data source?**
Date::Indian gives correct answers which matches with hard copy panchangams available in India

**Are there any other alternative (better) data sources?**
Desktop programs like [Jagannatha Hora](https://en.wikipedia.org/wiki/Jagannatha_Hora) calculate with better precision for different locations

**What are some example queries that trigger this instant answer?**
panchangam, panchangam 1 year ago, panchangam 12/12/12

**Which communities will this instant answer be especially useful for? (gamers, book lovers, etc)**
People interested in vedic / hindu / lunar / sidereal time keeping and astrology.

**Is this instant answer connected to a DuckDuckHack [instant answer idea](https://duck.co/ideas)?**
No

**Which existing instant answers will this one supercede/overlap with?**
Currently the queries "panchangam"/"panjika" returns the wikipedia summary which this goodie will overlap with

**Are you having any problems? Do you need our help with anything?**

Is there a better template to display this data ?
Is it OK to reuse the record template html structure and classes ?
Is it OK to provide Previous and next day links ? Are there icons for left and right arrows ?

**\*\*Note:** Please attach a screenshot for new instant answer pull requests, and for pull requests which modify the look/design of existing instant answers.
![image](https://cloud.githubusercontent.com/assets/21616/3855958/c77cd792-1eed-11e4-95e3-673a4f74e72f.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:
    - Linux (Ubuntu)
        [X] Google Chrome   
        [X] Firefox         

    - Android
        [X] Firefox         
        [X] Native Browser  
        [X] Google Chrome   
```

Maybe we can just compute with integers too, e.g., multiply with `3600` instead of `3600.0`.