Use long options in PacmanHelper.
Fix the log message when syncing (installing) packages via pacman.
Use #pkg_cmd in PacmanHelper#has_pkg?.
Use --noprogressbar when syncing packages via pacman.
Use the pacman exit code in PacmanHelper#has_pkg?.
Add pacman packages to 'linux build tools'.
Merge branch 'pacman' -- improve package support on arch linux.

- Use the return value when checking if a package is installed
- Long options for readability
- Better logging
- Update 'build tools' to support arch.
Add a messy version of 'release'.
Clean up the 'release' deps and add some more checks.
Warn when a release newer than the given version already exists.
Merge branch 'release' -- some deps for creating versioned releases.
v0.16.5 - Improved the arch package helpers and added deps to automate releases.