included btrace jars
included BTrace script used to profile Java KRun; minor refactorings to ease the writing of BTrace script or circumvent BTrace bugs
excluded BTrace script from build process; added javadoc for package profile
fixed a bug introduced in preivous commit where I removed a "System.exit(0)" in krun.Main
moved btrace script under src/main/btrace to follow maven structure
Merge pull request #304 from yilongli/master

included BTrace script for profiling Java KRun