Merge branch '2.0'

Merge branch '2.0'

Merge branch '2.0'

Merge branch '2.0'

Merge pull request iview#1066 from iview/2.0

2.0

Merge pull request iview#1062 from iview/2.0

2.0

Merge pull request iview#1023 from iview/2.0

修复导航栏bug

Merge pull request iview#1015 from iview/2.0

添加多语言示例页，支持自定义指定首页

Merge pull request iview#1011 from iview/2.0

恢复添加标签导航右侧关闭下拉菜单，同时还支持在标签上右键关闭

Merge branch '2.0'