Add metering command

Changelog for v0.2.9:

Commits
94ef691 Update message by @alexellis
0c4b9e9 Improve error handling for metering command by @alexellis
40ac180 Bind command to root by @alexellis
7238886 Update vendor by @alexellis
dbf0156 Add metering command by @alexellis

Changes: v0.2.8...v0.2.9

Generated by Derek