Version 2.4-1

• New: Can now specify reference level for contrast plots by including x variable in cond list (pull request #33, thank you @jealie!)
• Changed: Default for transformed outcomes now rug=2
• Changed: Default color for persp plot
• Changed: visreg(fit) no longer plots constant objects
• Changed: Appearance of strip names for numeric 'by' variables
• Fixed: plot.visreg wasn't plotting gg objects by default
• Fixed: Bug in formula parsing w/ complicated interactions
• Fixed: Bugs in ggFactorPlot
• Fixed: print.cond warning using warning() instead of printing text