Add foreign key constraints to cascade deletes.
Misc fixes
Merge branch 'master' of github.com:jsha/blocktogether
Rename index-bt-user-creation migration to match right format
Store size on BlockBatch
Merge pull request #104 from jsha/blockbatch-count

Store size on BlockBatch
Fix warning message
Version 0.5.1.
Remove sequelize.sync() on startup.
Remove order clause from findAndUpdateUsers to run faster.
Cascade updates as well as deletes.
Merge pull request #102 from jsha/cascade-deletes

Add foreign key constraints to cascade deletes.
Constant time comparisons and index on shared_blocks_key.
Restore order to update-users.
Version 0.5.2
Add indices on Actions table.
Improve Actions indexes.
Trim old blocks

Call destroyOldBlocks in finalizeBlockBatch to remove all but two latest
BlockBatches for user when a new BlockBatch is retrieved successfully.