Add the contributor agreement.
Add link to .dmg
Change directions.
Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
[elm-server] add --port=... command line option.
Merge pull request #166 from laszlopandy/master

Allow elm-server to use a different port than 8000.
Merge pull request #165 from A1kmm/let-type-annotations

Support type annotations in let