Restructured genomic coordinate conversion handling for variants.

Moved that logic into the converters.

Also:
* bug fix for readsToGAlignments converter
* restored Rproj file for running roxygen via RStudio
* bumped package version
* updated dependencies per R CMD check
Fix formatting.

By removing the .Rprofile note for now.
Fix plot label.
Merge branch 'master' of github.com:deflaux/api-client-r
Added package install instructions.

For packages that are not part of the GoogleGenomics R client per great feedback from @ttriche and @pgrosu
Merge pull request #19 from deflaux/master

Restructured genomic coordinate conversion handling for variants.