Address Collision of Contract Address Causes Exceptional Halt (#689)
* Add an EIP about making contract creation fail on address collision
* Use 689
https://github.com/ethereum/EIPs/pull/689#discussion_r154454788
* Adjust formats
according to https://github.com/ethereum/EIPs/pull/689#issuecomment-376559878
* Cleanups by @Arachnid
GitHub Diff