Removed default password for the admin user

Any security hash can be used before changing password

Signed-off-by: Prashant Shah <pshah.mumbai@gmail.com>
Update readme

Signed-off-by: Prashant Shah <pshah.mumbai@gmail.com>
Update chnagelog

Signed-off-by: Prashant Shah <pshah.mumbai@gmail.com>
Merge remote-tracking branch 'upstream/master'