Merge pull request #958 from ddurnev/master

[RJA-2272][feature]: Modify DSL to support readonly attribute for workflow object
Merge pull request #959 from ddurnev/master

[RJA-xxx] version 2.3.0-SNAPSHOT bump
[RJA-2261][feature] - Running jobs UI support
[RJA-2200][feature] - Backend support
[RJA-2200][feature] - UI support without poller
Merge pull request #960 from ddurnev/master

[RJA-2274][feature]: Modify workflow engine to skip instance update on workflow termination
Merge pull request #961 from rsvato/feature/rja-2200

[RJA-2200][feature] - List of running jobs
[RJA-2172][feature] - NuGet  support for datasources
[RJA-2231][feature] - Use Http client to handle authorization
Merge pull request #962 from rsvato/nuget

[RJA-2172][feature] - NuGet  support for datasources
Merge branch 'Relese_2_2_0'
[Megre] - Merge NuGet support to 2.3.0
Merge pull request #963 from rsvato/master

Merge NuGet to a master
[RJA-2317][fix]: ExternalUserDetailsService - single query to get group authorities