IA Page <-> Topics many to many relationship
ddgc_add_topic.pm - create script to add entries to the topics table
create topic and add to topics in IA
update for topics many-to-many rel, and delete some unused code that was used for xslate version
delete unused metadata file
check if topic already exists for this ia
remove debugging from iameta
Merge pull request #309 from duckduckgo/topic_updates

some changes for topics many-to-many relationship
Merge pull request #305 from duckduckgo/topics_list

IA Page <-> Topics many to many relationship