Upgrade to AspectJ 1.7.1

This change upgrades the spring-framework build to AspectJ 1.7.1 to
ensure compatibility. We remain backward-compatible to at least AJ
1.6.12 (the previous version), and likely back to 1.6.7.

AJ 1.7 allows for weaving Java 7 bytecode, particularly with regard
to invokedynamic instructions, and furthermore makes improvements to
the aspectj language itself to allow users to take advantage of Java 7-
style language features within aspects. See [1] for details.

[1]: http://eclipse.org/aspectj/doc/released/README-170.html

Issue: SPR-10079

build.gradle

@@ -9,7 +9,7 @@ buildscript {
 }
 
 configure(allprojects) {
-	ext.aspectjVersion  = "1.6.12"
+	ext.aspectjVersion  = "1.7.1"
 	ext.easymockVersion = "2.5.2"
 	ext.hsqldbVersion   = "1.8.0.10"
 	ext.junitVersion    = "4.11"

src/dist/changelog.txt

@@ -6,6 +6,7 @@ http://www.springsource.org
 Changes in version 3.2 GA (2012-12-12)
 --------------------------------------
 
+* upgraded to AspectJ 1.7.1 (SPR-10079)
 * spring-test module again depends on junit:junit for JUnit 4.11 (SPR-10044)
 * upgraded Spring Framework build and test suite to Joda-Time 2.1, Groovy 1.8.8, JRuby 1.6.5
 * checked compatibility of Spring's Velocity support with Velocity 1.7 and Velocity Tools 2.0