Merge branch 'release-0.3.0' into develop
update version to 0.4.0-SNAPSHOT
bump specs2 version
drops the views package
sbt and specs version bumps
removes license headers
replace String format with String interpolation
support for marking xy/category domain and range axes
using JavaConverters and Numeric context bounds
animations / live chart updates in README
API URL build settings
chart companion template class
XYChart companion
CategoryChart companion
no defaults in companion, consistent from peer
provide documentation macros as a trait
better doc macros integration for chart companion
RingChart now has proper companion
PieChart now has proper companion
MultiplePieChart now has proper companion