Removed as part of cleanup
Moved vignette builder to knitr
Small changes to documentation to pass R CMD CHECK
Remove tabs from show method to make the format independent on the tab width settings
Change from tabs to space in show method to make it independent on tab width settings
Removed bug when no modifications where present
Small change in roxygen comments to make documentation pass R CMD CHECK
Updated documentation
Added vignette
Merge branch 'master' of https://github.com/thomasp85/mzID