Merge branch 'release/1.13.3'
Merge branch 'release/1.13.3'
Merge branch 'develop'
[#97] Embed images FLOW app

* Only delegate video preview
[#123] Instantiate List in the constructor

* Avoid null values
[#122, #115] Delete media files
[#126] Parse survey group info

* Read attributes from the XML file
* Perform tmp hack to support 'Projects'
* Store survey group in the DB
[#126] Fix survey group parsing

* Copy the field from the populated survey
[#126] Ensure the group is set for regular surveys
[#97] Always pass the record id as parameter
[#128] Create transmission for synced forms

* Use UUID as filename
* Create start and end dates
[#126] Remove props file
Merge pull request #130 from akvo/feature/bootstrap

Feature/bootstrap
[#127] Allow monitoring survey download (manual)

* Remove assignment restriction
[#127] Handle API error codes

* Extend HTTP status codes to represent custom statuses.
* Display localized messages upon errors.
* Do not read the input stream if the status is not 200.
[#115] Remote Exception regression fix

* Clean up
[#131] Query IN_PROGRESS transmissions

* Ensure no in_progress file is stalled
[#83] Bump version number
[#97] Simplify query

* No need to JOIN. I have no idea why it that way...
[#97] Clean up - simplify DB loaders