1. Fix: Data updated but error thrown because of deleted records.

1. Fix: Atomic file not updated, Hard link issue.
2. Add: Create temp directory if not present at app root.

now we dont have to specify each index field in selector to update record

1. Fix: Bad connection error on mysql connection reset.

1. Fix: Data not updated because of safe write

1. Fix: Bucket id generated for existing bucket

1. Add: FileType key constant

Delete function wrapper and function name changes

1. Add: Use custom save function for lazy writer

1. Add: Logs and comments

1. Add: Lazy writer support to write index files.
2. Fix: Index JSON not updated in case of update data.

Coremongo package update

added reindexing feature in fdb,
added filepack module,
modification in filemdl module

1. Fix: Server connecting to 0 port if not provided

1. Fix: Panic if data to bulk functions is empty array.

1. Fix: Panic if selected single object is not included in final result. The post hook was dereferrencing nill data resulting in panic.

1. Fix: Revert coremongo panic fix as its breaking existing sls functionality. Need to check for empty arrays instead of empty string in existing code.

1. Fix: Nil pointer dereference error for Result.

1. Fix: failed to connect to primary 

1. Add: prefer connection to primary

This reverts commit 5571f2a3