Figure out HTML title from plot contexts
Add Calendars, Colors, Gauges and TwinAxis examples
Fix spelling mistake in DarkKhaki color
Allow to serialize Option[_] in anyToJson()
Add default value for Text.angle property
Update joda-time to version 2.6
Generalize SampleData to support other types of data sources
Add support for ICalendar (via ical4j) to SampleData
Add USHolidays to sampledata and glyphs/Calendars example
Import from sampledata in glyphs/Calendars