v1.0.0-beta.0

• Refactor to use ember-basic-dropdown
• Add month & year picker
• Add startWeekOnSunday option (PR by rafael-paiva via #6)

Note for upgrades
If you upgrade from a previous version, and use ember-cli-sass, don't forget to import the ember-basic-dropdown partial: import "ember-basic-dropdown";. If you are using e.g. ember-power-select, you don't need to do this.