Language file is create under po/.
Korean translation is updated.
Informative message if no id.vars
Merge pull request #40 from kevinushey/master

Avoid using memcpy on STRSXPs
Update readme
Move to markdown news
Merge pull request #38 from tonytonov/master

Informative message if no id.vars
Tweak message
Merge pull request #32 from ghost/master

language support
Useful error message if you use value_var.
Closes #16
Add useful error message if value.var doesn't exist.
Closes #9
Merge branch 'master' of github.com:hadley/reshape
Preserve classes of measure variables in melt.data.frame (#21)