fix(es6 import): adding support for es6 imports + switching to webpack

docs(language): adding language documentation

Merge pull request #20 from xevinbox/master

feat(language): add Russian lang

feat(weekStart): adding weekStart property to define when the week sh…

…ould start

closes #11

fix(locked): adding event in args

event wasn't included in args which caused bugs in some browsers

fix(languages): adding aliases to existing languages

fix(date limitation): minDate/maxDate could not be reset

adding null check to reset minDate/maxDate

fix(color): added color definition to datepickk container

color was not defined on datepickk container, which resultet in wrong text colors if a color was set

on the body element

fix(style): adding overflow:hidden to year/month chooser -> IE render…

…ed wrong

feat(onNavigation): adding new callback: onNavigation -> triggers whe…

…n the visible date changes