Added more description for ons-navigator
Merge branch 'dev' of https://github.com/OnsenUI/OnsenUI into dev

Conflicts:
	build/docs/en/api/directives/directive/ons-col.html
	build/docs/en/api/directives/directive/ons-icon.html
	build/docs/en/api/directives/directive/ons-if-orientation.html
	build/docs/en/api/directives/directive/ons-if-platform.html
	build/docs/en/api/directives/directive/ons-list-header.html
	build/docs/en/api/directives/directive/ons-list-item.html
	build/docs/en/api/directives/directive/ons-list.html
	build/docs/en/api/directives/directive/ons-navigator.html
	build/docs/en/api/directives/directive/ons-page.html
	build/docs/en/api/directives/directive/ons-sliding-menu.html
	build/docs/en/api/directives/directive/ons-split-view.html
	build/docs/en/api/directives/directive/ons-switch.html
	build/docs/en/api/directives/directive/ons-tabbar.html
	build/docs/en/api/directives/directive/ons-toolbar-button.html
	build/docs/en/api/directives/directive/ons-toolbar.html
	build/docs/ja/api/directives/directive/ons-col.html
	build/docs/ja/api/directives/directive/ons-icon.html
	build/docs/ja/api/directives/directive/ons-if-orientation.html
	build/docs/ja/api/directives/directive/ons-if-platform.html
	build/docs/ja/api/directives/directive/ons-list-header.html
	build/docs/ja/api/directives/directive/ons-list-item.html
	build/docs/ja/api/directives/directive/ons-list.html
	build/docs/ja/api/directives/directive/ons-navigator.html
	build/docs/ja/api/directives/directive/ons-page.html
	build/docs/ja/api/directives/directive/ons-sliding-menu.html
	build/docs/ja/api/directives/directive/ons-split-view.html
	build/docs/ja/api/directives/directive/ons-switch.html
	build/docs/ja/api/directives/directive/ons-tabbar.html
	build/docs/ja/api/directives/directive/ons-toolbar-button.html
	build/docs/ja/api/directives/directive/ons-toolbar.html
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