Fixing typo in hammer.sh PYTHONPATH -> $PYTHONPATH
Fixing typo in hammer.sh
PYTHONPATH -> $PYTHONPATH

Review URL: http://codereview.chromium.org/69023
labdong801/swtoolkit,flagxor/swtoolkit,David-Haim/swtoolkit,labdong801/swtoolkit,David-Haim/swtoolkit,flagxor/swtoolkit