Release v3.0

Closed 10+ issues since last release:
#9, #40, #51, #52, #55, #63, #64, #66, #68, #70, #71

• Add alternative --flag=parameter syntax for relevant options
• Fix for installing groups and virtual packages
• Fix to allow installing cached packages without Internet
• Implement unit tests using bats (see: test.bats)
• Add regex/wildcard (ex: apacm.*) support to -S and -Ss
• Return status code 1 on errors
• Improve viewing package comments (-W)
• Update manpages