Fix spelling

Fix spelling

* master: (183 commits)
  Run checks
  Add batch effects to vignette
  Update splatEstimate to set batchCells
  Add batch effects to splatSimulate
  Update SplatParams
  Bump version number
  Update citation
  Fix error handling when fitting means
  Fix comparison plots
  Bioconductor 3.5 release
  bump x.y.z versions to odd y after creation of 3_5 branch
  Creating branch for BioC 3.5 release
  bump x.y.z versions to even y prior to creation of 3_5 branch
  Update NEWS and DESCRIPTION
  Version 0.99.15
  Remove dropout.present estimation
  Add limits to zeros plots
  Adjust default splat DE fac params
  Add BPPARAM to scDDSimulate
  Add summariseDiff function
  ...

From: Luke Zappia <lazappi@users.noreply.github.com>

git-svn-id: file:///home/git/hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/splatter@131029 bc3139a8-67e5-0310-9ffc-ced21a209358

git-svn-id: https://hedgehog.fhcrc.org/bioconductor/branches/RELEASE_3_5/madman/Rpacks/splatter@129128 bc3139a8-67e5-0310-9ffc-ced21a209358

* master:
  Bump version number
  Update scDD reference
  Add addGeneLengths to vignette
  Add addGeneLengths tests
  Add addGeneLengths function
  Update Roxygen version
  Update README
  Add bioc-devel to Travis

From: Luke Zappia <lazappi@users.noreply.github.com>

git-svn-id: file:///home/git/hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/splatter@126415 bc3139a8-67e5-0310-9ffc-ced21a209358

* master:
  Bump version number
  Update scDD reference
  Add addGeneLengths to vignette
  Add addGeneLengths tests
  Add addGeneLengths function
  Update Roxygen version
  Update README
  Add bioc-devel to Travis

From: Luke Zappia <lazappi@users.noreply.github.com>

git-svn-id: https://hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/splatter@126415 bc3139a8-67e5-0310-9ffc-ced21a209358

git-svn-id: file:///home/git/hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/splatter@125902 bc3139a8-67e5-0310-9ffc-ced21a209358

git-svn-id: https://hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/splatter@125902 bc3139a8-67e5-0310-9ffc-ced21a209358

* Bump R version to 3.4
* Add row, col names to matrices

* Add Anthony's comments
* Use biocLite to install