XD-1634 Update Spring Integration to 4.0.0.RELEASE

JIRA: https://jira.spring.io/browse/XD-1634
Fix servlet-api dependency

- Fix servlet-api dependency in `spring-xd-test-fixtures` and `spring-xd-shell` sub-projects
XD-1599 replacing springsource references
XD-1261: Derive default values for xml module options
XD-1261 changes on merge
Fix DIRT dependency on xerces

- Exclude `xerces` from spring-xd-dirt compile dependency
Fix XD shell xerces dependency

- exclude xerces dependency in `spring-xd-shell` project
Enable Git integration for generated IDEA project file