wip
bolt db works
add travis deps
save horizon with transactions
fix all iterator
port 117 fix to bolt
slight improvement by appending deltas first
Merge branch 'master' into bolt_json
117 patched in
Merge branch 'log_database' into boltdb
store less duplicate data in the indices
Merge branch 'master' into boltdb
concrete deltas
improve cost of bolt iterator
Merge branch 'master' into boltdb
Merge branch 'master' into boltdb
Move remove() and removeAll() to tests

This is done to keep deadcode quiet.
Cleanup based on comments
Optionalize the sync parameter
Merge pull request #139 from kortschak/deadcode

Move remove() and removeAll() to tests