Merge 3.1.0 development branch into trunk

Branch in question is 'env' branch from git://git.springsource.org/sandbox/cbeams.git; merged into
git-svn repository with:

    git merge -s recursive -Xtheirs --no-commit env

No merge conflicts, but did need to

    git rm spring-build

prior to committing.

With this change, Spring 3.1.0 development is now happening on SVN
trunk. Further commits to the 3.0.x line will happen in an as-yet
uncreated SVN branch.  3.1.0 snapshots will be available
per the usual nightly CI build from trunk.

org.springframework.spring-parent/pom.xml

@@ -14,7 +14,7 @@
   <artifactId>spring-parent</artifactId>
   <packaging>pom</packaging>
   <name>Spring Framework - Parent</name>
-  <version>3.0.5.BUILD-SNAPSHOT</version>
+  <version>3.1.0.BUILD-SNAPSHOT</version>
   <description>Spring Framework Parent</description>
   <scm>
     <url>https://fisheye.springframework.org/browse/spring-framework</url>