v0.2.0

appc spec version: v0.7.1+git5a7af19

• Automatically fills in the os and arch labels on new builds.
• The --modify flag failed to properly use an alternate work context.
• The help page has been reformatted.
• Extracting ACIs during begin no longer requires root.
• Modifying an existing ACI that didn't have the app field set would cause an
  error.
• Copy now has two modes of operation, toggled with the -T flag. The new mode
  allows copying many files at once into the ACI, as opposed to a single one.
• When using begin with a local file, the path must now start with a ., ~,
  or /.

The following commands have been added to acbuild since the last release:

• cat-manifest
• isolator add
• isolator remove
• replace-manifest
• set-event-handler pre-start
• set-event-handler post-stop
• set-working-directory