#7283 Config trendline to handle percentages
#7283 Base chart class
#7283 Refactored trendline displays into strategies
#7283 Refactored trendline displays into strategies. Multiple fixes.
#7283 Percentage for simple series
#7283 Correctly show selected option on trendline
#7283 Handle percentages for split trendline
#7283 Handle percentages for date compare trendline
#7283 Handle percentages for location compare
Merge branch 'master' into feature-trendline_percentage

Conflicts:
	app/scripts/models/charts_trendline.coffee
#7283 Cleanup of trendline model