Move modules to independent build files

The main `build.gradle` file contains now only the common build
infrastructure; all module-specific build configurations have
been moved to their own build file.

Issue: SPR-15885

spring-aspects/spring-aspects.gradle

@@ -1,3 +1,5 @@
+description = "Spring Aspects"
+
 // redefine the compileJava and compileTestJava tasks in order to
 // compile sources with ajc instead of javac
 
@@ -81,3 +83,27 @@ compileTestJava  {
 		}
 	}
 }
+
+
+dependencies {
+	aspects(project(":spring-orm"))
+	ajc("org.aspectj:aspectjtools:${aspectjVersion}")
+	rt("org.aspectj:aspectjrt:${aspectjVersion}")
+	compile("org.aspectj:aspectjweaver:${aspectjVersion}")
+	optional(project(":spring-aop"))  // for @Async support
+	optional(project(":spring-beans"))  // for @Configurable support
+	optional(project(":spring-context"))  // for @Enable* support
+	optional(project(":spring-context-support"))  // for JavaMail and JSR-107 support
+	optional(project(":spring-orm"))  // for JPA exception translation support
+	optional(project(":spring-tx"))  // for JPA, @Transactional support
+	optional("javax.cache:cache-api:1.0.0") // for JCache aspect
+	optional("javax.transaction:javax.transaction-api:1.2")  // for @javax.transaction.Transactional support
+	testCompile(project(":spring-core"))  // for CodeStyleAspect
+	testCompile(project(":spring-test"))
+	testCompile("javax.mail:javax.mail-api:${javamailVersion}")
+}
+
+eclipse.project {
+	natures += "org.eclipse.ajdt.ui.ajnature"
+	buildCommands = [new org.gradle.plugins.ide.eclipse.model.BuildCommand("org.eclipse.ajdt.core.ajbuilder")]
+}