read J2SE jars from bootclasspath if wala.properties cannot be loaded
enable running wala.core.tests in maven build
changes to get tests passing on Java 7
add surefire plugin version
pass appropriate VM args when running tests
Disable certain tests when analyzed classes are in a jar file.

These tests create FileModules for certain class / source files,
and hence assume those files are sitting in the filesystem.  We
should come up with a better fix here.
fix up wala.core.testdata structure so things work from maven

We put all the jar files (the testdata jar, JLex, etc.) in the root
directory now, and set up the build.properties so that these jars get
copied into the final plugin jar, making the tests work properly from
maven.  We also still copy the jars into the bin/ directory, so the
Eclipse launchers still work.