Added cran-comments.md and .Rbuildignore

Author: davidcsterratt

pkg/retistruct/.Rbuildignore

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+cran-comments.md

pkg/retistruct/cran-comments.md

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+CHANGES IN VERSION 0.5.12 - Released 2017/08/08
+
+NEW FEATURES
+
+* AnnotatedOutline() and Outline() are exported to allow use with
+  external packages
+  (https://github.com/davidcsterratt/retistruct/issues/17)
+  Thanks to Brian Cohn for the report and the patch.
+
+BUG FIXES
+
+* Documentation has been spell checked using devtools::spell_check()
+  (https://github.com/davidcsterratt/retistruct/issues/19)