message: java gradle: Make readme less confusing.
diff: -To build with a development version of this plugin, repeat as follows:
  +To build with a development version of this plugin, enter the directory
  +containing this README and repeat as follows:
  * make changes
  * gradle build
  -* mvn install:install-file -Dfile=${BOND_JAVA_ROOT}/gradle-plugin/build/libs/bond-gradle-1.0.jar -DgroupId=org.bondlib -DartifactId=gradle -Dversion=1.0 -Dpackaging=jar
  +* mvn install:install-file -Dfile=build/libs/bond-gradle-1.0.jar -DgroupId=org.bondlib -DartifactId=gradle -Dversion=1.0 -Dpackaging=jar
  This will install the plugin to your local maven repository, which the other
  Java projects' build.gradles will use in preference to maven central.
  