One way to distribute our token is to sell it. We will set a fixed price for each token. The tokens will have to be send to the Smart Contract by their owner initally.
### Instructions
- Create a Smart Contract `TokenSale`
- The contract imports MinimalToken
- Create a `constructor` function that takes as parameter the address of a deployed `MinimalToken` and the price of a token (in wei).
- Create a public payable function `buy()` that sends to the buyer token proportionally to the value send.
- Create a public function `getPrice()` that returns the price of the token.
- Create a public function `collect()` that allows the initial deployer of the contract to collect the proceedings from the sale
