changes to ease use of WALA from an executable jar.  also some very
basic support for GXL, a graph format used by some software engineering
tools.
Merge branch 'master' of https://github.com/wala/WALA.git
switch back to rhino-1.7R3.jar, to be compatible with maven
config file for Travis CI
add missing copyright headers
Fix thread-safety bug in BytecodeClass.computeMethodMap

The map must not be modified after BytecodeClass.methodMap
has become non-null.
Merge pull request #24 from sewe/upstream

Fix thread-safety bug in BytecodeClass.computeMethodMap
enable maven building of wala.core.testdata, and use project-specific compile settings