Update to maven-tools 1.2.2

Eliminates issues with removed File.exists? method.

See jruby/maven-tools#40

Author: headius

ruby-tools/pom.xml

@@ -213,7 +213,7 @@
         <dependency>
           <groupId>rubygems</groupId>
           <artifactId>maven-tools</artifactId>
-          <version>1.2.1</version>
+          <version>1.2.2</version>
           <type>gem</type>
           <scope>provided</scope>
         </dependency>