Use simple caching instead of caching decorator class
Define default normalize method
Append '%' for usage (instead of '_percent') and '/s' for rates (instead of '_rate')
Add standardised output for each class for documentation purposes
Remove filters when testing ProcCgroups()
Make ProcCpuinfo() simpler and more efficient
Make ProcDiskstats() simpler and more efficient
Make ProcInterrupts() simpler and more efficient
ProcLoadavg() tidy up
Tidy up ProcMeminfo() class
Tidy up ProcNetArp() class
Tidy up ProcNetDev() class
Tidy up ProcNetRpcNfs() class
Tidy up ProcNetRpcNfsd() class
Tidy up ProcNetSnmp() class
Tidy up ProcPartitions() class
Tidy up ProcSchedstat() class
Tidy up ProcStat() class
Document cached ProcSysKernel*() classes
Tidy up ProcUptime() class