Adds EIP 998 (ethereum#1252)

* Create eip-173.md

* Removed "review-period-end"

* Update eip-173.md

Fixed the notice for the transferOwnership function.
Stated that emitting the OwnershipTransferred event on contract creation is unspecified.

* Update eip-173.md

Updated info about the OwnershipTransferred event.
"The OwnershipTransferred event does not have to be emitted when a contract is created."

* Update eip-173.md

Set the discussions-to data.

* Create eip-998.md

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