Import reshape2 instead of reshape
Fix variable_name -> variable.name

Thanks Dieter Menne for pointing this out.
Automatic reorder by Roxygen2
Replace cast() by dcast() from reshape2
Replace X1/X2 by Var1/Var2

reshape2's melt() names its columns Var1/Var2
while reshape used to name them X1/X2
Require coda
Prevents dimension dropping when removing lp__

If there is only one parameter other than lp__, subsetting the matrix
turns it into a vector with no dimensions, thus causing ggs_chain to
fail when assessing the number of samples.

Using drop=FALSE ensures that the matrix stays a matrix, even if it has
only one column.
Merge branch 'includeCoda'

Conflicts:
	DESCRIPTION
Merge branch 'convertFromStan'