Merge branch 'release/0.7.3' into develop
Bumped version to 0.8.0a1
Update scrapy_mongodb.py

item fields serializer are called before inserting into mongodb. This way is easy to clean up a field data before inserting.
Merge branch 'italomaia-master' into develop
Removed unnecessary whitespaces #23
Removed unneeded variable #23
Updated release notes for 0.8.0
Bumped version to 0.8.0
Merge branch 'release/0.8.0'