support for BiocCheck

Provide support for [`BiocCheck`](http://www.bioconductor.org/packages/devel/bioc/html/BiocCheck.html).
-  REQUIRED (equivalent to an ERROR in R CMD check): red
- RECOMMENDED (equivalent to a WARNING in R CMD check): red
- CONSIDER (similar to NOTE): cyan (new)
Note that `R CMD BiocCheck` is redirected to `stderr`, thus the `2>&` in the `bioccheck-only`.