expect quoting only on field beginning

I think the following example:
`random field content containing "some quoted text" without being quoted itself`
shouldn't be handled as a `quotedField`.
(I personally need this tolerance because I have to parse user provided csv files ...)
What do you think?

I also updated the `README.md`  `node-formidable` example (I needed these changes to got it work).

Ah and... thanks for ya-csv :-)