Merge pull request #16 from MatthiasLohr/feature/GradleBuild

added gradle build file

.gitignore

 .DS_Store
 .idea/*
 *.iml
+build/
 target/*

build.gradle

+apply plugin: 'java'
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    compile 'org.codehaus.jackson:jackson-core-asl:1.9.9'
+    compile 'org.codehaus.jackson:jackson-mapper-asl:1.9.9'
+    compile 'commons-io:commons-io:1.4'
+    testCompile 'org.hamcrest:hamcrest-all:1.3'
+    testCompile 'junit:junit:4.11'
+    compile fileTree(dir: 'libs', include: ['*.jar'])
+}
\ No newline at end of file