Add simple and real-estate calculator

For create the simple Calculator  I used a plugin https://github.com/rcoelros/jquery-blackCalculator:

In vendor/asset added: 
```
       jquery.blackcalculator-1.0.min.js
       jquery.blackcalculator.src.js
```
For the real estate calculator I created some partial and one js file  in app/asset  to do calculations