updated .travis.yml of devel branch to reflect master
fix against pip packages version checks
added more clear logging message
enforced receipt of 16 bytes length
Merge branch 'devel' of github.com:globaleaks/GLBackend into devel
fixed some texts of Nodes.md
readded receiver.password in admin_serialize_receiver
added coverage omit for globaleaks/db/update_*.py
improved unit testing and code coverage
added test for migration scripts; archived old empty/populated databases
removed check that introducted bug in fields validation: https://github.com/globaleaks/GLBackend/commit/24df5eba4b2cdc640ca1485d8ef3d3c1362df1e3
enforced download authentication against current logged user
improved test_submissions.py and other UTs
improved fix of https://github.com/globaleaks/GlobaLeaks/issues/829
added unit tests for file collections: zip, tar, targz, tarbz2, antani
improved solution implemented in commit https://github.com/globaleaks/GLBackend/commit/f9c9b8b09fc14198c418f13d9959abe00cea5cc4
removed outdated comment
added Norwegian Bokmål translation
Use by default receipts of length 16 numbers.
Implement download of files via POST based FORM