Mandrill Merge Vars

[jbernardo95]

This PR resolves #39

Adds a function to easily add Mandrill Merge Vars to an email.

Example:

email |> put_merge_vars(users, fn(user) -> %{first_name: user.first_name} end)

[jbernardo95]

@paulcsmith Can I get a review here ? 🙂

[paulcsmith]

What do you think about moving the example above the "A convenience function for:"

[paulcsmith]

Could you indent this two spaces? Either that or put it on the same line and make the function multiline like this:

email = MandrillHelper.put_merge_vars email, users, fn(user) ->
  %{full_name: user.full_name}
end

[jbernardo95]

Still trying to get used to the code standards x)

Fixed.

[paulcsmith]

@jbernardo95 Thanks for the PR. This looks awesome! Just a couple comments

[jbernardo95]

@paulcsmith Updated.

[paulcsmith]

Thanks @jbernardo95! Nice work