update gradle configuration to something more recent (2.1+)

apparently i was unknowningly using a very old version of gradle. oops.

README.md

@@ -12,15 +12,21 @@ seems he uses LiveSplit now (?).
 Regardless, here I will be extending the original application as best I can by adding some missing features here and 
 there and fixing bugs as needed.
 
-## Building
+## Building and Running
 
-You will need Gradle 1.x. You can build an uberjar (a JAR containing all library dependencies inside it) by running:
+You will need Gradle. The Gradle `application` plugin is being used, so you can run Llanfair simply by doing:
+ 
+```
+$ gradle run
+```
+
+To package up a JAR file for redistribution, run:
 
 ```
 $ gradle shadowJar
 ```
 
-Which will spit out a JAR under `build/libs` under the naming convention `llanfair-[VERSION]-all.jar`.
+Which will spit out an "uber JAR" under `build/libs` under the naming convention `llanfair-[VERSION]-all.jar`.
 
 ## TODO
 

build.gradle

@@ -1,10 +1,21 @@
-apply plugin: 'java'
-apply plugin: 'com.github.johnrengelman.shadow'
+buildscript {
+	repositories { jcenter() }
+	dependencies {
+		classpath 'com.github.jengelman.gradle.plugins:shadow:1.2.2'
+	}
+}
+
+plugins {
+	id 'java'
+	id 'application'
+	id 'com.github.johnrengelman.shadow' version '1.2.2'
+}
 
 sourceCompatibility = 1.7
 targetCompatibility = 1.7
 
 version = '1.4.3'
+mainClassName = 'org.fenix.llanfair.Llanfair'
 
 repositories {
 	mavenCentral()
@@ -15,16 +26,3 @@ dependencies {
 	compile 'com.1stleg:jnativehook:2.0.2'
 	compile 'com.thoughtworks.xstream:xstream:1.4.4'
 }
-
-buildscript {
-	repositories { jcenter() }
-	dependencies {
-		classpath 'com.github.jengelman.gradle.plugins:shadow:1.2.2'
-	}
-}
-
-shadowJar {
-	manifest {
-		attributes 'Main-Class': 'org.fenix.llanfair.Llanfair'
-	}
-}