Added support for CR as line-end char

[kriyative]

No description provided.

[davidsantiago]

What is this for? The end-of-line is already configurable with the :end-of-line argument in both reading and writing.

[kriyative]

1. CR is the line-end convention used by Excel on OSX for CSV exports, so it seems to be quite common in the wild
2. end-of-line does allow passing in CR, but that requires the caller to know a-priori the convention used in the file being read
3. Adding a layer around clojure-csv to pre-test the line-end seems excessive, especially when clojure-csv is doing that anyway

Perhaps, I've missed something about the intended use of end-of-line ... would be happy to understand.

Cheers.

[Boubalou]

That is exactly what I was about to code. Well, any chance it gets merged so we do not have to fork it ourself.