Merge pull request #1 from lwaldron/master

microarray, RNA-seq, and microRNA ExpressionSets for ovarian cancer from...
new materials contributed by Tim Triche, some infrastructure for R package
first converter from ExpressionSet to SummarizedExperiment, with illustration
export the coercion method
added some setAs doc...
coercion now succeeds on sample.ExpressionSet, needs man page
new manual page and some code improvements
new data and vignette update to show translation of RNA-seq data
Expression x3, Methylation x2, somatic mutations and copy number for GBM, from Markus Riester.