add thread and note api (bug 879545)
add a <noscript> tag (bug 883325)
add Communication to list of doc topics (bug 879545)
add in a NO_CHARGE purchase type and check for that on receipt (bug 882473)
Reverting "use celery's task dependency management to chain and parallelize reindexing. (bug 867289)"
Reverting "some missed celery calls"

This reverts commits 3d91a0ae132ef5601f1e8f35dd7cce4d6e9d4eb2 and
164d41e4b6678bafbc0b12a141643ce812ed9678.
Reverting "remove celery_tasktree (bug 880008)"
Revert "remove celery_tasktree (bug 880008)"

This reverts commit cd8a9ac9f626eec411ef4595db3cbe0fd39e399f.
remove more set_price
update docs (bug 878324)
fix up json and rst
Allow filtering by manifest_url in search api (bug 879437)
Removed category facet from searches (bug 883430)
Add method to tiers for optgroups WiP (bugs 882831, 882836)