SPRING: Fixed Spring version used in xsd URL

- Use version-less URL for Spring xsd validators.
- Set version 3.1 in manually added spring.handlers and spring.schemas.
- Removed many unused or duplicite context definitions.

Now correct mapping should be provided by Spring libraries, which maps
URLs to classpath.
Merge pull request #387 from zlamalp/spring

SPRING: Fixed Spring version used in xsd URL

- Use version-less URL for Spring xsd validators.
- Set version 3.1 in manually added spring.handlers and spring.schemas.
- Removed many unused or duplicite context definitions.