Overload methods on EtdIdUtils to take EtdContractSpec and security instances

[cjkent]

EtdIdUtils has helper methods to create IDs for EtdContractSpec, EtdOptionSecurity and EtdFutureSecurity. These methods have separate parameters for each item of information, for example the exchange ID and contract code.

There are cases where you need to generate an ID from an existing contract spec or security and it would be useful if there were overloads for this.

[jodastephen]

EtdFutureSecurity.of() already exists to do this? Or am I missing something.

[cjkent]

No, it was me that was missing something :)