Added CPU Info pulled from sysctl

Upon doing this I renamed CPU Speed to CPU Cores and removed the speed
as it is in the CPU Type field now.
Added Migration

Changed Schema in machine_model.php to 3 and added
003_machine_add_cpu.php to perform migration and add new column.
Removed duplicate < in machine_info.php
Updated Migration for adding cpu column
Added Closing Tag to CPU field
$ sign Fixed.
Changed buffer size
Fix merge() in core

isset() fails when initial value is NULL
Merge branch 'pr/83' into wip