This PR creates the r-watermelon package, along with dependencies.
- new package: r-fdb-infiniummethylation-hg19
- new package: r-illuminahumanmethylation450kanno-ilmn12-hg19
- new package: r-lumi
- new package: r-methylumi
- new package: r-roc
- new package: r-txdb-hsapiens-ucsc-hg19-knowngene
- updated package: r-matrixstats, new version needed as a dependency
