Fix the command line tools

[cygri]

The command line scripts (shell scripts and Windows .bat files) are just copied from D2RQ and don't work with the new Maven project setup.

Minimal steps to get ./validate to work:

• mvn compile
• mvn mvn dependency:copy-dependencies
• In the validate script, make the following changes:
• Change $D2RQ_ROOT/build to $D2RQ_ROOT/target/classes
• Change the two paths being scanned for jars to just "$D2RQ_ROOT"/target/dependency/*.jar
• Change the log4j.properties location to $D2RQ_ROOT/src/main/resources/log4j.properties
• Change the invoked class from d2rq.validate to org.d2rq.cli.validate

This makes the script work, but it's probably not quite the right thing to do if we will make available a binary download for end users. Such a binary download should either contain just a single jar with all dependencies included, or a flatter directory layout (not everything deep under src/main and target).