Installed local repo using pip
Unicode joins
Temporarily mark data with the technique that produced it
Giving up feeds altogether
Get canonical urls, but drop the videos
Extractor returns raw dictionary

And doesn't care about the Extracted class. The returned dictionary
will be loaded into Summary gradually.
Preparing TwitterSummaryCardTags technique
MissingSchema fix
Mark technique flag
Don't mark the technique
Refactor changes into a DictExtractor and keep behavior of Extractor consistent with previous.
Add implementation and tests for twitter summary card technique.
Merge pull request #1 from lethain/svven

Merge pull request #1 from lethain/svven
Extractor returns only specified data types
Merge pull request #2 from svven/master

Extractor returns only specified data types
Merge pull request #3 from lethain/svven

Merging progress from @ducu