Use 'slc clusterctl' in usage when run from slc
Merge pull request #35 from strongloop/features/slc-support

Use 'slc clusterctl' in usage when run from slc
v0.4.0
Merge branch 'release/0.4.0' into production
Merge tag 'v0.4.0'

v0.4.0
fix broken links in README

Close #38
Add uptime to worker status

Uptime is measured in microseconds using Date.now()
Add utility to humanize duration
test: expand tests to include worker properties
Ensure workers are proper before extracting status

Control channel is needed to generate uptime.
Improve readability of 'clusterctl status'

Use a human friendly format for uptime