Prefix subprojects with 'smack-'

instead of using the old baseName=smack appendix=project.name approach,
we are now going convention over configuration and renaming the
subprojects directories to the proper name.

Having a prefix is actually very helpful, because the resulting
libraries will be named like the subproject. And a core-4.0.0-rc1.jar is
not as explicit about what it actually *is* as a
smack-core-4.0.0-rc1.jar.

SMACK-265

core/build.gradle

@@ -1,57 +0,0 @@
-description = """\
-Smack core components."""
-
-configurations {
-	compression
-	dns
-}
-dependencies {
-	compile 'xpp3:xpp3:1.1.4c'
-	testCompile 'junit:junit:4.+'
-	testCompile 'xmlunit:xmlunit:1.5'
-	testCompile 'org.powermock:powermock-module-junit4:1.5.+'
-	testCompile 'org.powermock:powermock-api-mockito:1.5.+'
-	testCompile 'com.jamesmurty.utils:java-xmlbuilder:0.6+'
-}
-jar {
-	manifest {
-		attributes('Bundle-SymbolicName': project.group,
-				   'Eclipse-ExtensibleAPI: true')
-		from sharedManifest
-	}
-}
-task compressionJar(type: Jar) {
-	appendix += '-compression'
-	dependsOn classes
-	from sourceSets.main.output
-	include('org/jivesoftware/smack/compression/**')
-	include('org/jivesoftware/smack/SmackConfiguration.class')
-}
-task dnsJar(type: Jar) {
-	appendix += '-dns'
-	dependsOn classes
-	from sourceSets.main.output
-	include('org/jivesoftware/smack/util/dns/**')
-	include('org/jivesoftware/smack/util/DNSUtil.class')
-}
-artifacts {
-	compression compressionJar
-	dns dnsJar
-}
-class CreateFileTask extends DefaultTask {
-	@Input
-	String fileContent
-
-	@OutputFile
-	File outputFile
-
-	@TaskAction
-	def createFile() {
-		outputFile.text = fileContent
-	}
-}
-task createVersionResource(type: CreateFileTask) {
-	fileContent = version
-	outputFile = new File(projectDir, 'src/main/resources/org.jivesoftware.smack/version')
-}
-compileJava.dependsOn(createVersionResource)