Fixes issue described in #38
/proc/stat reports a blank line which needs to be ignored.
Old kernels misses one CPU time field, this needs to be ignored too.
Switch to Update using the Collecter Collect interface, due to not knowing all
metricnames in all modules beforehand we can't use Describe and thus the full
Collecter interface.
Remove 'updates', it's meaning varies by module and doesn't add much.
Daniel Speichert
Tobias Schmidt
Brian Brazil
Bjoern Rabenstein