remove swap functions (since we no longer store them in the db)
bugfix, ram_used should use ram_free and ram_total
always return ints from memory.py since that's all the DB will handle
rename ram_free/ram_used -> free_ram/used_ram to better match config and db names
Merge pull request #111 from pyfarm/sysinfo_memory_update

sysinfo memory update and bugfix