Merge branch 'ide-pending-tab' into 'master'

...s/javascripts/ide/components/commit_sidebar/list_item.vue

app/assets/javascripts/ide/components/ide.vue

app/assets/javascripts/ide/components/repo_editor.vue

app/assets/javascripts/ide/components/repo_file.vue

app/assets/javascripts/ide/components/repo_tab.vue

app/assets/javascripts/ide/components/repo_tabs.vue

app/assets/javascripts/ide/ide_router.js

app/assets/javascripts/ide/lib/common/model.js

app/assets/javascripts/ide/lib/common/model_manager.js

app/assets/javascripts/ide/stores/actions.js

app/assets/javascripts/ide/stores/actions/file.js

app/assets/javascripts/ide/stores/mutation_types.js

app/assets/javascripts/ide/stores/mutations/file.js

app/assets/javascripts/ide/stores/utils.js

...vascripts/ide/components/commit_sidebar/list_item_spec.js

spec/javascripts/ide/components/repo_tab_spec.js

spec/javascripts/ide/components/repo_tabs_spec.js

spec/javascripts/ide/lib/common/model_manager_spec.js

spec/javascripts/ide/lib/common/model_spec.js

spec/javascripts/ide/lib/decorations/controller_spec.js