Version 2.14.0

• Fixing issue where C3js tooltips contained rounded numbers (#751 #692 #716)
• C3js tooltips and axes now use the aggregators' number formatters (i.e. the one from the locale file) so we have separators and percent signs by default, and dollar signs etc if people define them (#667)
• Default number formatter now always shows zero values, which undoes a bad early design decision which hid the difference between zero and 'no value' (#567 #550 #237 #139)
  • note that the count aggregator still doesn't ever return zero, because aggregators are not invoked when no data is present.