Merge pull request #27 from zotya/master

Added intervals and trendlines
Refs #18299; Fixed issue with duplicated % on axes
Merge branch 'master' of https://github.com/collective/eea.googlecharts
Refs #18299; Fixed duplicated % on horizontal axis
Refs #18577; Fixed filters position when switching tabs inside an indicator
Refs #18505; Fixed width for filters when positioned in left or right of the chart
Refs #18262; Fixed palette problems when Automatic colors are selected
Refs #18400; WIP: Adding screencasts to editor