remove link to obsolete presentation on gh-pages
new plot style: replace ggplot2 with leaflet
remove dependency on lubridate package
missed rCharts package dependency
fix circuit list in UI: replace observe() with renderUI()
make get_position() returns a data.frame
change comments
change name of environment containers and some functions
this guardian becomes redundant after removal of observe()
remove redundant test for NULL
Merge branch 'map'