added 'out' to excluded dirs; changed exclude_dir in tools/gyp_utils.py from single string to a list in order to accept multiple excluded dirs; performance tune by moving exclusion check to outer loop
using list comprehension for exclude_dir_list
Merge pull request #13 from racker/songgao/added_out_into_excluded_dir_for_bundle

added 'out' to excluded dirs; changed exclude_dir in tools/gyp_utils.py from single string to a list in order to accept multiple excluded dirs; performance tune by moving exclusion check to outer loop