feat(MdDatepicker): emit date without confirming (#1426)

* feat(MdDatepicker): emite date without confirming

* feat(MdDatepicker): allow reset of value after clicking cancel

* Revert "feat(MdDatepicker): allow reset of value after clicking cancel"

This reverts commit 561c15a.

* feat(MdDatepicker): allow field to be clearable

Author: Samuell1

src/components/MdDatepicker/MdDatepicker.vue

@@ -1,5 +1,5 @@
 <template>
-  <md-field :class="['md-datepicker', { 'md-native': !this.mdOverrideNative }]">
+  <md-field :class="['md-datepicker', { 'md-native': !this.mdOverrideNative }]" md-clearable>
     <md-date-icon class="md-date-icon" @click.native="toggleDialog" />
     <md-input :type="type" ref="input" v-model="modelDate" @focus.native="onFocus" pattern="[0-9]{4}-[0-9]{2}-[0-9]{2}" />
 

src/components/MdDatepicker/MdDatepickerDialog.vue

@@ -314,6 +314,7 @@
       selectDate (day) {
         this.currentDate = setDate(this.currentDate, day)
         this.selectedDate = this.currentDate
+        this.$emit('update:mdDate', this.selectedDate)
       },
       closeDialog () {
         this.$emit('md-closed')