Delete SmartToken old docs

docs/source/SmartToken

-SmartToken
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-Inherits from contract StandardToken. Implementation of a ERC20 compatible token with methods to transfer value and execute calls in transfers and approvals (see https://github.com/ethereum/EIPs/issues/20)
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-approveData(address _spender, uint _value, bytes _data) returns (bool success)
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-It allows to approve the transfer of value and execute a call with the sent data.
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-function transferData(address _to, uint _value, bytes _data) returns (bool success)
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-Transfer tokens to a specified address and execute a call with the sent data on the same transaction
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-transferDataFrom(address _from, address _to, uint _value, bytes _data) returns (bool success)
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-Transfer tokens from one address to another and make a contract call on the same transaction
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