Add jarDebug/Release tasks to simplify release deployment

Releases include JAR files uploaded in the github releases system which
are clumsy to extract from the AAR files.  With this new task, it is
easier to do a release using just `gradle uploadArchives jarRelease` and
then uploading the resulting jar files (base + javadoc + sources jar)

release.gradle

@@ -33,6 +33,13 @@ afterEvaluate { project ->
         from android.sourceSets.main.java.srcDirs
     }
 
+    android.libraryVariants.all { variant ->
+        def name = variant.name.capitalize()
+        task "jar${name}"(type: Jar) {
+            from variant.javaCompile.destinationDir
+        }
+    }
+
     artifacts {
         archives androidJavadocJar
         archives androidSourcesJar

stetho-okhttp/build.gradle

@@ -52,4 +52,4 @@ dependencies {
     androidTestCompile 'com.squareup.okhttp:mockwebserver:2.2.0'
 }
 
-apply from: '../release.gradle'
+apply from: rootProject.file('release.gradle')

stetho-urlconnection/build.gradle

@@ -17,4 +17,4 @@ dependencies {
     compile 'com.google.code.findbugs:jsr305:2.0.1'
 }
 
-apply from: '../release.gradle'
+apply from: rootProject.file('release.gradle')

stetho/build.gradle

@@ -37,4 +37,4 @@ dependencies {
     androidTestCompile 'org.powermock:powermock-module-junit4:1.6.1'
 }
 
-apply from: '../release.gradle'
+apply from: rootProject.file('release.gradle')