2.22.2
Move es6 files to src, add transpile and qtest grunt tasks
Replace double with single quotes
Fix duration functions to follow tests
Use ratios to convert bubble days to months and years
Fix #4078: Implement a clone method for durations
Add missing word to comment
Using character class instead of non capturing group
Allow user to get/set the rounding method used when calculating relative time
Remove s/ss global flag
FFS
Fix #4072: Use indexOf util for IE8 compatibility