Fix #674: graceful exit when having config file issues
ensure close file before rename bookmark file.
Merge pull request #850 from oliveagle/more_informative_api_get_servers

makes listServers api more informative
Add admin assets fix to CHANGELOG.
Merge pull request #849 from runner-mei/gs2

ensure close file before rename bookmark file.
Fix a few typos
Update database configuration to validate shard spaces before creating anything.

Fixes #860. Update the validate method on shard spaces to optionally check if the database exists.
Add optional pausing to data migration.
Merge pull request #861 from influxdb/860-validte-shards

Update database configuration to validate shard spaces before making db
Merge pull request #863 from influxdb/862-slow-data-migrator

Add optional pausing to data migration.
Don't ever try to query or write against a shard that is closed or deleted.

Uses a RWlock so there's no global lock on writes or queries.
Update CHANGELOG.md
Merge pull request #866 from influxdb/779-threadsafe-shard-deletion

Don't ever try to query or write against a shard that is closed or delet...
validate that shard spaces have a non-empty regex
Fix the changelog
Format @pauldix code
Merge pull request #857 from oliveagle/more_informative_api_get_servers

GetLeaderRaftConnectString returns consistent result
Merge pull request #856 from rubenk/fix-typo

Fix a few typos
Merge pull request #795 from DavidBord/fix-674-graceful-exit

Fix #674: graceful exit when having config file issues
Don't accidentally trigger continuous query backfilling