Update `.editorconfig`

Update and add to the content from the `.editorconfig` file in order to
reflect the current state of things.
Add missing `newline` at the end of files

Under UNIX-like OSes, a text file consists of a series of lines, each
of which ends with a `newline` character (`\n`). A file that is not
empty and does not end with a `newline` is therefore considered not to
be a text file.

Because of this, utilities that are supposed to operate on text files
may not cope well with files that don't end with a `newline` (e.g.:
they might ignore the text after the last `newline`).

Adding the `newline` character at the end of files ensures that users
won't encounter any odd behavior when using it.

Reference/Source: http://unix.stackexchange.com/a/18789.
Add `.gitattributes` file