Remove depreciated JUnit tests

No longer needed, because the tests were replaced by Spock tests.

Author: dexX7

build.gradle

@@ -12,7 +12,6 @@ repositories {
 
 dependencies {
     compile group: 'net.java.dev.jna', name: 'jna', version: '4.2.0'
-    testCompile group: 'junit', name: 'junit', version:'4.12'
 
     testCompile "org.codehaus.groovy:groovy:2.4.4"
     testCompile('org.spockframework:spock-core:1.0-groovy-2.4') {