[1.0.x] + (additional commit for) rework the fix #954
https://java.net/jira/browse/GRIZZLY-954
"Grizzly somehow mixes sessions from different requests returning wrong resource"

More work on backwards compatibility
[1.0.x] [maven-release-plugin] prepare release 1_0_49
[1.0.x] [maven-release-plugin] prepare for next development iteration