Non-existent function, so removed to avoid warning.
Make collation work

To make collation work, all methods needed to come out
of AllGenerics.  I moved them into a new file called
Methods.R.  Ideally, I would split these out into
class-specific methods, but not right now.  I added
collation field to DESCRIPTION and this now loads
without errors or warnings.
Removed importFrom graphics--not needed I don't think and was source of a warning.
Cleanup of methylumiset class, just a bit.
Fixed up a few argument partial matches.
.gitignore for Rstudio project files.
Added .Rbuildignore for RStudio project files.
.gitignore again
Add missing require(TxDb.Hsapiens.UCSC.hg19.knownGene)
Fixed small documentation warnings and added a vignettedepends to 450k vignette.
.gitignore
Version bump