Refactor build.gradle & add artifactory support

Artifactory enables publishing snapshots of droiddriver
jcenter is only for released artifacts and doesn't allow snapshots

Change-Id: Ifb5b5a6e5de081516ec8ffbb81190776aa0658c2
diff --git a/artifactory.gradle b/artifactory.gradle
new file mode 100644
index 0000000..d9f9039
--- /dev/null
+++ b/artifactory.gradle
@@ -0,0 +1,27 @@
+apply plugin: 'maven-publish'
+apply plugin: 'com.jfrog.artifactory'
+
+publishing {
+    publications {
+        mavenJava(MavenPublication) {
+            groupId ddGroup
+            artifactId ddArtifactId
+            version ddVersion
+        }
+    }
+}
+
+artifactory {
+    contextUrl = 'http://oss.jfrog.org/artifactory'
+    publish { // gradle clean artifactoryPublish
+        repository {
+            repoKey = 'oss-snapshot-local'
+            username = bintray_user
+            password = bintray_key
+            maven = true
+        }
+        defaults {
+            publications('mavenJava')
+        }
+    }
+}