new gradle plugins block + fatJar (#560)

* new gradle plugins block + fatJar

* Adding support for the new gradle plugins block
* Using the shadow plugin to create a fatJar for appium java client.

* reverting change

shadow is only on jcenter. So, need to add it to buildscript for satisfying dependency.

* fix repo

Author: shauvik

build.gradle

@@ -18,16 +18,19 @@ repositories {
 
 buildscript {
     repositories {
+        jcenter()
         maven {
             url "http://repo.maven.apache.org/maven2"
         }
     }
     dependencies {
         classpath "org.owasp:dependency-check-gradle:1.4.0"
+        classpath 'com.github.jengelman.gradle.plugins:shadow:1.2.4'
     }
 }
 
 apply plugin: "org.owasp.dependencycheck"
+apply plugin: 'com.github.johnrengelman.shadow'
 
 configurations {
     ecj