More user friendly error message for required parameters

[wolfdancer]

Instead of the following error (also it probably should not generated twice, and the "Build Failed" should be at the last line it can be something like
target foo (line 133) requires parameter "message"

---

Done parsing Aardvark buildfile in 1584 ms

foo:
test

bar:

BUILD FAILED
java.lang.IllegalArgumentException: requires parameter "message"
at gw.vark.AardvarkProgram$AardvarkTarget.determineStringParamVal(AardvarkProgram.java:366)
at gw.vark.AardvarkProgram$AardvarkTarget.execute(AardvarkProgram.java:336)
at org.apache.tools.ant.Target.performTasks(Target.java:411)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399)
at org.apache.tools.ant.Project.executeTarget(Project.java:1368)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1251)
at gw.vark.AardvarkProgram.runBuild(AardvarkProgram.java:159)
at gw.vark.Aardvark.run(Aardvark.java:169)
at gw.lang.Gosu.start(Gosu.java:131)
at gw.lang.launch.GosuLauncher.run(GosuLauncher.java:132)
at gw.lang.launch.GosuLauncher.main(GosuLauncher.java:45)

Total time: 0 seconds
java.lang.IllegalArgumentException: requires parameter "message"
at gw.vark.AardvarkProgram$AardvarkTarget.determineStringParamVal(AardvarkProgram.java:366)
at gw.vark.AardvarkProgram$AardvarkTarget.execute(AardvarkProgram.java:336)
at org.apache.tools.ant.Target.performTasks(Target.java:411)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399)
at org.apache.tools.ant.Project.executeTarget(Project.java:1368)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1251)
at gw.vark.AardvarkProgram.runBuild(AardvarkProgram.java:159)
at gw.vark.Aardvark.run(Aardvark.java:169)
at gw.lang.Gosu.start(Gosu.java:131)
at gw.lang.launch.GosuLauncher.run(GosuLauncher.java:132)
at gw.lang.launch.GosuLauncher.main(GosuLauncher.java:45)
requires parameter "message"