Add Solhint linter for verification of smart contract code

[idrabenia]

Hi Guys,

We develop code linter - Solhint, that provide:

1. Strict source code validation according Solidity Style Guide
2. Security code check using ConsenSys Guide for Smart Contracts
3. Best practices code validation

We think that it would be awesome to add some kind of code validation to your project.

You may contact us - we will be glad to help!
- Ilya

[D-Nice]

This is something we have spoken about internally. Thanks for bringing this forward, I will ask others to review.