updated all variables to follow the underscore convention#15

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areejalsheikh wants to merge 4 commits intokatholt:masterfrom

areejalsheikh:shinyPlotTree

Commits on Apr 19, 2015

Added bar plot part
areejalsheikh
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Commits on Apr 25, 2015

Commits on Apr 26, 2015

changed layout of parameters settings and main panel
areejalsheikh
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