Yihui Xie faf87a5dee Closes #810: check if the input file is encoded in UTF-8 and warn if not ...

The validUTF8() function is still in R-devel, and they probably will never export it, so let's use iconv(x, from = 'UTF-8', to = 'UTF-8') to test if x is encoded in UTF-8

also closes #1113

2016-02-19 00:02:25 -06:00

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