revert log scale plot
Merge commit 'e41941f43648be3b177f42079246551e0778a6c7' into Refactoring_log_scale_plot

Conflicts:
	app/assets/javascripts/plot.js
revert log scale for figure viewer
enable to change log scale in line_plot
refactoring line plot
refactoring scatter plot
refactoring figure viewer
make class for plot
update line plot with like class
refactoring
remove a member of Plot.scales
do not update mouse event on LinePlot.UpdatePlot()
delete button calls LinePlot destructor
add ScatterPlot class
update scatter plot
add FigureViwer class
refactoring for many things
require each *.js in applocation.js(plot.js and explore.js are required from view)
make explore class and parallel_coordinate_plot class
refactoring many things, but a bag to remove brush from pc_plot is left