Truffle execute external script call contract function

errors:

 * Error: VM Exception while processing transaction: out of gas
 * Error: Cannot create instance of YourContract; no code at address
 * Error: sender account not recognized
 * Error: invalid address

If you get some of these errors while trying to execute contract function from truffle script, here is proper way to do it:

	//First get all accounts on testrpc
	web3.eth.getAccounts((err, acc) => {
	let accounts = acc;
	contract.deployed().then(function(instance){
	//you need to specify from and gas parameters
	instance.yourFunction(someParam, {from: accounts[0], gas: 500000});
	}).then(function(result) {
	console.log(result);
	});
	});

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