npm test was failing due to an empty line in tests/unit/unitTests.txt.
Handling returnVal and exceptionVal properly in Multiple.js and Single2.js
bounded path search in Single2.js
handling exceptional paths in Multiple.js
more on exceptional path handling in Multiple.js
changed analysis.js for direct mode.  Now absolute path of an analysis file can be given to analysis.js in direct mode.
bounded call stack search.
added two more tests to multiex
statistics collection for multiex
more accurate operation counting in Single2
MAX_CALL_DEPTH moved to PathConstraints.js
Liang Gong's fix for issue #52.
modification to log info
resolve conflict
fix a bug due to conflict resolve