begin to fix the variable selection
add temp fix
add secondary density line
minor fix
Began work on quit function
Fixed merge conflict
Merge pull request #10 from reinholdsson/fix-select-filter

Fix select filter
Merge branch 'regression' of https://github.com/reinholdsson/iPlot
Merge branch 'master' of https://github.com/reinholdsson/iPlot into regression
Merge branch 'regression'