2.2.0

• fix wrong logic for iAvg() function (not calculating the arithmetic mean)
• fix wrong heart rate max/min value
• fix loading of multiple maps in same page
• add spec folder and uvu package (fast and lightweight testing suite)
• add spec/utils.test.js
• add npm run test implementation
• fix broken loading of chart handlers for false option values (eg. time: false)
• make use of the handlers: [] option instead to set inclusion / exclusion rules for all the dynamically imported modules
• add running pace sample (src/handlers/pace.js)