add external examples.

remove comment.

Author: Sirokujira

bld.bat

@@ -1,3 +1,6 @@
+pip install -r requirements.txt
+rem pip install -e .
 python setup.py build_ext -i
 python setup.py install
+rem python setup.py bdist_wheel
 nosetests -A "not pcl_ver_0_4"