Fixes #199. Specify read access for pathToRoot

Modified the test to use anonymous access
Merge pull request #216 from girder/public-item-visibility

Fixes #199. Specify read access for pathToRoot
Give each server test its own assetstore

There were several race conditions that actually manifested as
errors on travis related to cleanup of the assetstore. So, we just
use a different subfolder for each test.
Merge pull request #218 from girder/assetstore-per-test

Give each server test its own assetstore
Merge remote-tracking branch 'origin/master' into collection-next-page-bug