Support CSV dialects in CLI

[alexshpilkin]

The library supports specifying a CSV dialect (e.g. TSV), and so does the CSVW spec in more or less the same manner, but the command-line tool doesn’t pick up this info. Why not?

[Note that there are some minimal changes in the CSVW spec compared to CSVDDF—e.g. lineTerminators (may be a string or array of strings) not lineTerminator. I’d be OK even with a CSVDDF-equivalent subset.]