fix for when typing invalid date thanks to @batiskafff

fixs by @typicalflow and @roger2hk

fix for #201 thanks to @tipycalFlow

new version

date-min-limit, date-max-limit, date-format watchers and date-typer f…

…ix thanks to @lucas3003 and @VKravchuk

date-week-start-day new option available thanks to @davidsandoz

Rotate arrow on toggling for Windows not showing unicode chars

Font fallback for Windows thanks to @Codesleuth

removed angular dependenciy in bower.json

removed awful in dateSet watcher