Spring bump to 4.1.1

[Cantor, Scott]

It appears that the conflict I was seeing with Spring and Web Flow is
because we weren't overriding the spring-expression version, rather than
an actual requirement to run SWF on the older version.

I don't really understand how to sanely manage transitive requirements if
you can (and aparently are supposed to) just ignore the declared
dependencies of other software, but I'll chalk it up to me being paranoid.

-- Scott