Add missing CPU field, change field length check

Fixes #54
Merge branch 'master' into net_snmp_stats
Set var for rate type
Get rid of metric variable, get rid of continue
Merge pull request #59 from StackExchange/net_snmp_stats

Net snmp stats
Default send location to http://bosun/

Optionally disable metadata sending. This is work to allow bosun to stop
relaying :4242 traffic.
Add more metadata. Also additional memory stats
Merge branch 'master' into meta_bf1

Conflicts:
	collectors/procstats_linux.go
Fix issues from PR. Mostly description formatting
Merge branch 'master' into meta_bf1

Conflicts:
	metadata/metadata.go
Merge pull request #60 from StackExchange/meta_bf1

Add more metadata. Also additional memory stats