new properties for 0.9.105: bar.barWidth

plus cleanup of column.columnWidth while i’m here
new properties for 0.9.105: bar.offset

plus cleanup for column.offset while i’m here
add additional styling example, because of #173
updates because #151: need to hard code default in config.md

because it is null in cartesian.js and linear in line.js, hard code the
docs to say linear (docs build process is pulling from the first place,
which is cartesian)
note that we support bower now