add settings_example.py
update requirements.txt to include scrapy-mongodb
remove settings.py from version control

you should copy settings_example.py to settings.py and modify as needed
add settings.py to .gitignore
Merge branch 'master' into pipeline-mongodb
Merge branch 'master' into pipeline-mongodb
rewrite mongodb pipeline
update settings_example.py
MONGODB_UNIQUE_KEY should not be optional
add comment on renaming settings_example.py in cfg
rename settings_example.py to settings.py.default
add step to create settings.py file in README.md
fix example settings filename in scrapy.cfg
Merge pull request #132 from fictivekin/pipeline-mongodb

Adds a pipeline to insert items into MongoDB