* propose Digital Identity Aggregator EIP
* update created date
* typo and emphasis fix
* Update and rename eip-x.md to eip-1484.md
* add persistent discussions-to link
* update solidity interface and implementation URL
add ERC-1484 references, update function signatures
* fix html linting errors
* make copy edits, ensure correctness of function and event signatures
* remove signature requirement for adding/removing providers
* trigger travis build, hopefully DNS issue is fixed
eips.ethereum.org had a DNS failure last build
