fix expanding zip files for groups in new files

also a couple other minor tweaks

test plan:
* enable better file browsing
* create a group
* visit the group files page
* upload a zip file
* extract the zip file
* should run successfully

closes #CNVS-18590

Change-Id: I57546b6c77302d7bef67ddbc9a10696670f38881
Reviewed-on: https://gerrit.instructure.com/48884
Tested-by: Jenkins
Reviewed-by: Dan Minkevitch <dan@instructure.com>
QA-Review: Jahnavi Yetukuri <jyetukuri@instructure.com>
Product-Review: James Williams  <jamesw@instructure.com>

app/coffeescripts/react_files/modules/ZipUploader.coffee

@@ -46,7 +46,7 @@ define [
 
     # get the content migration when ready and use progress api to pull migration progress
     getContentMigration: =>
-      $.getJSON("/api/v1/courses/#{@contextId}/content_migrations/#{@contentMigrationId}").then (results) =>
+      $.getJSON("/api/v1/#{@contextType}/#{@contextId}/content_migrations/#{@contentMigrationId}").then (results) =>
         if (!results.progress_url)
           setTimeout( =>
             @getContentMigration()
@@ -68,9 +68,9 @@ define [
 
     onMigrationComplete: ->
       # reload to get new files to appear
-      promise = @folder.files.fetch({reset: true}).then =>
-        @deferred.resolve()
-
+      @folder.folders.fetch({reset: true}).then =>
+        @folder.files.fetch({reset: true}).then =>
+          @deferred.resolve()
 
     trackProgress: (e) =>
       @progress = (e.loaded/ e.total)

lib/unzip_attachment.rb

@@ -88,6 +88,7 @@ class UnzipAttachment
   # Tempfile will unlink its new file as soon as f is garbage collected.
   def process
 
+    Folder.reset_path_lookups!
     with_unzip_configuration do
       zip_stats.validate_against(context)