update response code by releasing collection
fixed wrong assertion
Merge branch 'develop' of https://github.com/MPDL-Innovations/imeji into develop
1) added new feature to the rest test framework: static content. It can be used for testing of the features where the and HTTP access to resources is needed, like update item with fetch file URL.
2) implemented rest features: update item with the file fetched/referenced via URL
+ rest test images