Appended section about how to setup Android development environment on OS X .
Updated mongoDB query examples.
Added notes-on-scrapy-*.md.
Added web/django/notes-on-django-models.md.
Added lang/py/py-cookielib-module.md.
Merge branch 'master' of github.com:shuge/man
Updated tools/ip-tools.txt.
Added lang/py/python-generators.md.