Add commonJS to UMD definition

For browserify compatiblity
fix for webkit page flickering when opening the picker
Add labels translation
Add labels translation
changelog updated
Merge pull request #451 from ozee31/dev

Add french labels translation
Merge branch 'dev' of https://github.com/amsul/pickadate.js into dev
changelog updated
Merge pull request #442 from dimafeldman/flickering_fix

fix for webkit page flickering when opening the picker
changelog updated
fixed #438
Merge pull request #437 from joeybaker/dev

Add commonJS to UMD definition
changelog updated
fixed #406: muted `clear`