Reclaim deleted partition now Free Space after Yosemite removal
I read a lot of blogs, tried different commands and finally got it fixed.


Reboot your Mac in Recovery mode using Command+R key combination during the boot up.
Start Terminal application from the recovery boot
Run command, diskutil cs list
See the last Logical Volume name, 76A3020B-B3C2-4905-9E09-2EBB5470261C

Use that in next command.
diskutil cs revert 76A3020B-B3C2-4905-9E09-2EBB5470261C

This should convert the CoreService Logical Volume to a Normal Disk partition.
Run command, diskutil cs list now, and you should receive message that no CS volumes.
Now, Reboot your MacOSX normally and once you login, start Disk Utility and resize your main partition "Machintosh HD" to claim all free space.