I think the following should do just fine, assuming you're data is in the file text

    d3heatmap
    data.table
    ggplot2
    htmltools
    htmlwidgets
    metricsgraphics
    networkD3
    plotly
    reshape2
    scales
    stringr

Let's use arrays which have the substitution down cold:

#!/bin/bash
input=( $(cat text) ) 
output=( $(
for i in ${input[@]}
        do
        echo -ne "'$i',"
done
) )
output=${output:0:-1}
echo ${output//,/, }

The output of the script should be as follows:

'd3heatmap', 'data.table', 'ggplot2', 'htmltools', 'htmlwidgets', 'metricsgraphics', 'networkD3', 'plotly', 'reshape2', 'scales', 'stringr'

I believe this was what you were looking for?

I think the following should do just fine, assuming you're data is in the file text

d3heatmap
data.table
ggplot2
htmltools
htmlwidgets
metricsgraphics
networkD3
plotly
reshape2
scales
stringr

Let's use arrays which have the substitution down cold:

#!/bin/bash
input=( $(cat text) ) 
output=( $(
for i in ${input[@]}
        do
        echo -ne "'$i',"
done
) )
output=${output:0:-1}
echo ${output//,/, }

The output of the script should be as follows:

'd3heatmap', 'data.table', 'ggplot2', 'htmltools', 'htmlwidgets', 'metricsgraphics', 'networkD3', 'plotly', 'reshape2', 'scales', 'stringr'

I believe this was what you were looking for?