enrichR v3.1

Changed to gracefully detect internet connection

enrichR v3.0

Updated enrichR.base.address
Included additional enrichr sites including FlyEnrichr, WormEnrichr, YeastEnrichR and FishEnrichR (Thanks to Alexander Blume)
Ability to generate a plot from the enrichment results (Thanks to I-Hsuan Lin)

enrichR v2.1

Fixed bug by adding .onLoad hook to setup initial options
Added bibliography directly and removed .bib as it was causing pandoc-citeproc problems with README.Rmd and vignette.
Corrected spelling error in vignette

enrichR v2.0.

Contains checks on enrichR website to ensure it is online.