install.packages("gridExtra", repos='http://cran.us.r-project.org')
install.packages("syuzhet", repos='http://cran.us.r-project.org')
install.packages("plotly", repos='http://cran.us.r-project.org')
install.packages ("reshape2", ='http://cran.us.r-project.org')
install.packages ("wordcloud", ='http://cran.us.r-project.org')
install.packages ("tm", ='http://cran.us.r-project.org')