fixes #259: disable file logging by setting system property "disable-file-logging"

Mustang-CLI/pom.xml

@@ -42,6 +42,11 @@
          <artifactId>jargs</artifactId>
          <version>2.0-SNAPSHOT</version>
       </dependency>
+      <dependency>
+         <groupId>org.codehaus.janino</groupId>
+         <artifactId>janino</artifactId>
+         <version>3.1.6</version>
+      </dependency>
       <dependency>
          <groupId>org.riversun</groupId>
          <artifactId>bigdoc</artifactId>

Mustang-CLI/src/main/resources/logback.xml

@@ -24,7 +24,11 @@
 
   <!-- Configure so that it outputs to both console and log file -->
   <root level="INFO">
+    <if condition='!isDefined("disable-file-logging")'>
+      <then>
         <appender-ref ref="FILE" />
+      </then>
+    </if>
     <appender-ref ref="STDERR" />
   </root>                                                                                                                                                                                                                                     
 </configuration>