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.expression/pom.xml

@@ -4,12 +4,12 @@
   <groupId>org.springframework</groupId>
   <artifactId>spring-expression</artifactId>
   <packaging>jar</packaging>
-  <version>3.0.5.BUILD-SNAPSHOT</version>
+  <version>3.1.0.BUILD-SNAPSHOT</version>
   <parent>
     <groupId>org.springframework</groupId>
     <artifactId>spring-parent</artifactId>
     <relativePath>../org.springframework.spring-parent</relativePath>
-    <version>3.0.5.BUILD-SNAPSHOT</version>
+    <version>3.1.0.BUILD-SNAPSHOT</version>
   </parent>
 
   <dependencies>