Update to Harvest 2.2+
Support branch@sha format for commit string
Revert migration to Haystack 2.0.0

This is a post-2.2 feature and is not available in an Avocado release.
Update Cilantro to 2.2.17
Update Serrano and Avocado to 2.3.0+
Add Fabric function to rebuild search index
Add python-memcached requirement
Update syncdb_migrate command to ignore ghost migrations
Adjust whoosh path to be in project root
Update to Avocado 2.3.1 and Serrano 2.3.3
Update to preview of Cilantro 2.2.20
Prevent loading cilantro/main on landing page
Update Cilantro to second preview
Update to Cilantro preview 3
Update to Cilantro preview 4
Cilantro 2.2.25 preview
Update to Cilantro 2.2.29, Avocado 2.3.3, Serrano 2.3.4
Merge branch 'master' into headless_test

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