Fix CRAN check notes

Had to deal with column names being created as part of the `gather()` operation.

.Rbuildignore

@@ -8,7 +8,6 @@ roxygen.R
 granovaGG.Rproj
 README.m*
 cran-comments.md
-LICENSE
 
 ^.*\.Rproj$
 

DESCRIPTION

@@ -82,6 +82,7 @@ Description: create what we call Elemental Graphics for display of
     files for individual functions.
 URL: https://github.com/briandk/granovaGG
 BugReports: https://github.com/briandk/granovaGG/issues
+License: MIT + file LICENSE
 Depends:
     R (>= 2.14.0),
 Imports:
@@ -102,4 +103,3 @@ Collate:
     'granovagg.1w.R'
     'granovagg.contr.R'
     'granovagg.ds.R'
-License: MIT + file LICENSE

R/granovagg.contr.R

@@ -323,8 +323,8 @@ granovagg.contr <- function(data,
     raw.data <- RenameSummaryColumnNames(raw.data)
     raw.data <- tidyr::gather(
       raw.data,
-      key = contrast_number,
-      value = score
+      key = "contrast_number",
+      value = "score"
     )
     summary.data <- GetGroupSummary(raw.data)
 
@@ -351,10 +351,10 @@ granovagg.contr <- function(data,
     standard.deviation <- NULL
 
     output <- data %>% 
-      dplyr::group_by(contrast_number) %>% 
+      dplyr::group_by(.data$contrast_number) %>% 
       dplyr::summarise(
-        group.mean = mean(score),
-        standard.deviation = sd(score),
+        group.mean = mean(.data$score),
+        standard.deviation = sd(.data$score),
         pooled.standard.deviation = mean(standard.deviation)^0.5
       )
     return(output)
@@ -438,12 +438,6 @@ granovagg.contr <- function(data,
     return(output)
   }
 
-  OptionalPlotPrinting <- function(output) {
-    if (print.four.plots.per.page) {
-      LayoutFourPlotsPerPage(output)
-    }
-  }
-
   PrintOutput <- function() {
     PrintLinearModelSummary(ctr$linear.model)
     PrintSummaryDataByContrast(ctr)