create a new file "file_utils.py" with the func "copyfile"
unzip file feature
unzip file feature
copy file feature without nose test
add Dell file header
refactor of copyfile and add nose test
Merge branch 'master' of github.com:ZHAndyWu/warrior into unzip_file

Conflicts:
	common/file_utils.py
Merge branch 'master' of github.com:ZHAndyWu/warrior into feature_optparse