Scroll to last visited block when popping to outline view
Scroll to last visited block when popping to outline view

JIRA: https://openedx.atlassian.net/browse/MA-1349

proversity-org/edx-app-ios,Ben21hao/edx-app-ios-enterprise-new,edx/edx-app-ios,yrchen/edx-app-ios,appsembler/edx-app-ios,edx/edx-app-ios,proversity-org/edx-app-ios,Ben21hao/edx-app-ios-enterprise-new,appsembler/edx-app-ios,appsembler/edx-app-ios,edx/edx-app-ios,Ben21hao/edx-app-ios-new,Ben21hao/edx-app-ios-enterprise-new,proversity-org/edx-app-ios,proversity-org/edx-app-ios,Ben21hao/edx-app-ios-enterprise-new,edx/edx-app-ios,proversity-org/edx-app-ios,Ben21hao/edx-app-ios-new,Ben21hao/edx-app-ios-enterprise-new,edx/edx-app-ios,yrchen/edx-app-ios,Ben21hao/edx-app-ios-new,Ben21hao/edx-app-ios-new,proversity-org/edx-app-ios,yrchen/edx-app-ios,appsembler/edx-app-ios,Ben21hao/edx-app-ios-new,edx/edx-app-ios,edx/edx-app-ios,appsembler/edx-app-ios