Merge pull request #864 from ddurnev/master

[RJA-1904][feature]: take build providers from application context
[RJA-1948][feature] - Define databag template format
[RJA-1948][feature] - Define databag template format
Merge pull request #865 from rsvato/databag-templates

[RJA-1948][feature] - Define databag template format
[RJA-xxx][fix]: don't fail when there are no build providers in app context