Merge branch 'release/5.0.0a1' into develop

Author: MarkusH

setup.py

@@ -4,7 +4,7 @@
 import codecs
 import os
 
-_version = "5.0.0.dev0"
+_version = "5.0.0a1"
 _packages = find_packages('.', exclude=["*.tests", "*.tests.*", "tests.*", "tests"])
 
 if os.path.exists('README.rst'):