v2.10.0
Merge branch 'release/2.10.0' into production
Merge tag 'v2.10.0'

2.10.0

 * package: update strong-arc to ^1.x (Sam Roberts)

 * Upgrade all simple dependencies (Ryan Graham)

 * package: use debug v2.x in all strongloop deps (Sam Roberts)

 * Include git commits in version output if available (Ryan Graham)

 * Add optional dependency on sl-blip (Ryan Graham)

 * Add `slc arc` command (Miroslav Bajtoš)