refactor(lifecycle): lifecycle methods prefixed w/ ionView

BREAKING CHANGES:

- Lifecycle method prefixes have changed to `ionView`
- `onPageLoaded` renamed to `ionViewLoaded`
- `onPageWillEnter` renamed to `ionViewWillEnter`
- `onPageDidEnter` renamed to `ionViewDidEnter`
- `onPageWillLeave` renamed to `ionViewWillLeave`
- `onPageDidLeave` renamed to `ionViewDidLeave`
- `onPageWillUnload` renamed to `ionViewWillUnload`
- `onPageDidUnload` renamed to `ionViewDidUnload`

src/components/picker/picker.ts

@@ -483,7 +483,7 @@ class PickerDisplayCmp {
     this.lastClick = 0;
   }
 
-  onPageLoaded() {
+  ionViewLoaded() {
     // normalize the data
     let data = this.d;
 
@@ -563,7 +563,7 @@ class PickerDisplayCmp {
     }
   }
 
-  onPageDidEnter() {
+  ionViewDidEnter() {
     let activeElement: any = document.activeElement;
     if (activeElement) {
       activeElement.blur();