v0.2.0

Main changelog:

• Code refactoring, cleanup and reorganization.
• More error detection and error handling.
• Many new helper functions.
• Email validation.
• -i, --install option to install to /usr/sbin/opkg-upgrade or a user specified location. The script name will always be opkg-upgrade.
• -u, --upgrade-check option to just check if upgrades are available.
• -l, --list-upgrades option to just list upgrades available.
• -e, --email-list option to print html formatted e-mail report.
• -s, --ssmtp option to send e-mail reports using the system's ssmtp package. The user need to install and configure ssmtp beforehand for this to work.
• -a, --always-send option to send e-mail reports even when no updates are available. By default e-mails are not sent if there are no updates available.
• -t, --text-only option to send emails in plain text format.