Use chartkick globally

* Clean up legacy charting imports
* Update existing donut and line charts
* Create helpers for parsing out existing chart data
* Move chart partials to a more common path

config/initializers/assets.rb

@@ -9,4 +9,3 @@ Rails.application.config.assets.version = '1.0'
 # Precompile additional assets.
 # application.js, application.css, and all non-JS/CSS in app/assets folder are already added.
 # Rails.application.config.assets.precompile += %w( search.js )
-Rails.application.config.assets.precompile += %w( Chart.min.js )

config/initializers/chartkick.rb

@@ -0,0 +1,4 @@
+Chartkick.options = {
+  height:      '150px',
+  content_for: :charts_js
+}