Closes #80

Fixes an NPE when deploying a process from the modeler.
Added user get, create and update + user-collection get
Added user picture get and update to REST
Added user-info create/get/update to REST
Added group create/get/update/list and delete to REST
ACT-1696: fix for ldap qa build (apache DS not shutting down quickly enough)
Merge branch 'master' of github.com:Activiti/Activiti
variables inclusion in query support expanded + history task query improved
small task query test change
Merge branch 'master' of https://github.com/Activiti/Activiti
Added creation/deletion of group membership
ACT-1696: fix for ldap qa build (typo)
fixes for mssql and db2 queries
fix for mssql and db2 queries
made XML encoding pluggable
Merge branch 'master' of https://github.com/Activiti/Activiti
Forcing termination of pool when timeout is reached in concurrency test
Excluding db2 from test
Added identitylinks to process-definitions in REST (candidate starter)
Added identitylinks to process-instance REST