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)
docs: fix bad markdown

The markdown renderer for npmjs.com can't handle the line break.
v2.10.1
Merge branch 'release/2.10.1' into production