Log message:
Move math/R-markdown to textproc/R-markdown and fix dependencies.

Note: this commit is part of reorganizing some of the recently
imported R packages, which are being reimported into more appropriate
categories (and removed from math) as a result of a recent discussion
on tech-pkg and privately with wiz@.  See the thread starting with:

  http://mail-index.netbsd.org/tech-pkg/2014/09/05/msg013558.html

Log message:
Initial revision of R-markdown v0.7.4.

Markdown is a plain-text formatting syntax that can be converted to
XHTML or other formats. This package provides R bindings to the
Sundown markdown rendering library.