added libs folder scanning, fixes #269

Author: AbrarSyed

src/main/java/net/minecraftforge/gradle/user/UserBasePlugin.java

@@ -481,13 +481,16 @@ protected void configureCompilation()
                 .plus(project.getConfigurations().getByName(CONFIG_MC))
                 .plus(project.getConfigurations().getByName(CONFIG_MC_DEPS)));
 
-        project.getConfigurations().getByName("compile").extendsFrom(project.getConfigurations().getByName(CONFIG_DC_RESOLVED));
+        project.getConfigurations().getByName(JavaPlugin.COMPILE_CONFIGURATION_NAME).extendsFrom(project.getConfigurations().getByName(CONFIG_DC_RESOLVED));
         project.getConfigurations().getByName(CONFIG_PROVIDED).extendsFrom(project.getConfigurations().getByName(CONFIG_DP_RESOLVED));
-        project.getConfigurations().getByName("apiCompile").extendsFrom(project.getConfigurations().getByName("compile"));
-        project.getConfigurations().getByName("testCompile").extendsFrom(project.getConfigurations().getByName("apiCompile"));
+        project.getConfigurations().getByName(api.getCompileConfigurationName()).extendsFrom(project.getConfigurations().getByName("compile"));
+        project.getConfigurations().getByName(JavaPlugin.TEST_COMPILE_CONFIGURATION_NAME).extendsFrom(project.getConfigurations().getByName("apiCompile"));
 
         Javadoc javadoc = (Javadoc) project.getTasks().getByName(JavaPlugin.JAVADOC_TASK_NAME);
         javadoc.setClasspath(main.getOutput().plus(main.getCompileClasspath()));
+        
+        // libs folder dependencies
+        project.getDependencies().add(JavaPlugin.COMPILE_CONFIGURATION_NAME, project.fileTree("libs"));
 
         // set the compile target
         javaConv.setSourceCompatibility("1.6");