Create an instance of smart-contract to interact with when contract address is not already specified

instance.ts

// this is useful when you have to interact with contract instanciated on-the-go from another contract and can't use the deployed() method of truffle-contract
/**
  *
  * @ABIJSON : a JSON object representing the ABI file ( mostly generated with a solidity compiler or a deployment framework ( embark / truffle )
  * @nodeEntryPoint : node of the ETH chain to interact with
  * @scDeployedAddress : Address of the contract to interact with 
  * @myMethod : Method of the smart contrac to call
  * @arg1,arg2,argN : some arguments for the method.  
  * @signatureAddress : address originating the transaction
  * @maxGas : gas that will be provided for the transaction. If can't be determined in advance, should be quite large, moreover if you plan to call a method that itself will deploy another contract
  *
**/
var sc = contract(<ABIJSON>);
sc.setProvider(<nodeEntryPoint>);
sc.at(<scDeployedAddress>).then((instance) => {
  return instance.<myMethod>(arg1, arg2,<argN>,{ from : <signatureAddress>, gas : <maxGas> });
})
.then((r) => { 
    console.log(r); // Result
 })
.catch((e) => { 
    console.log(e); // Error 
});

We assume here we're using typescript

TODO : provide another gist for ABI-less methods calls