Add support for configuring data source about activiti HOT 2 OPEN

I've just done some preliminary testing, and it works ok after few known bumps :-) I'm also using activiti-spring-security plugin, and I was able to login with user/role stored in default data source, while activiti executed a process (with full history) against another data source. All activiti data was stored correctly, and querying is working too.

Since I'm using activiti-spring-security plugin, I had this issue: http://jira.grails.org/browse/GPSPRINGSECURITYCORE-114
When I changed spring-security-core's User implementation as suggested there (http://jira.grails.org/browse/GPSPRINGSECURITYCORE-114?focusedCommentId=67373&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-67373), all pieces start working.

from activiti.

Thanks for further writing and provide solutions for the bumps you hit. I will add multiple data source support in next release of the plugin.

from activiti.