Removed the flickr-importer line from docs as this is no longer applicable

TODO: Create and link to a document that explains how to import stuff
from flickr, twitter, etc.

Change-Id: I8b525a11cf3b240e7a91bf1daac87572b66afd5e
C+A: add Ritesh Sinharitesh

Change-Id: Id8a6cd784cc08535acb97819f3d7059b2ec2c2e8
Merge "Removed the flickr-importer line from docs as this is no longer applicable"
schema: add UnknownLocation and IsZoneKnown

Change-Id: Ia056d03a367502ea4d06e5748cc7de7072c3e12c
schema/nodeattr: new leaf package for permanode attributes

All the attributes from pkg/importer/attrs.go should eventually move here.

Change-Id: I252749ca32fdb0f367dfa906e728d0a679e8eb5b
schema: add test of time.ParseInLocation with UnknownLocation

Change-Id: I23c1007b53d794e36e9eeaad03e9d11a4cd3c397
importer/flickr: used DateCreated attribute

Change-Id: I481647d2cddd59a9821daf318e7dc5844525ac91