handle multiple versions

[petejkim]

• [x] activate version on install
• [x] start/stop/status/restart should control current active version
• [ ] parts list

mongodb (2.4.6)
php5 (5.5.8-nitrous2)
apache2 (2.4.6, 2.4.7*)

* indicates selected version

• [ ] parts which - list selected versions

mongodb 2.4.6
php5 5.5.8-nitrous2
apache2 2.4.7

• [ ] parts which apache2

apache2 2.4.7

• [ ] parts switch apache2 2.4.6 - activate older version for use
• [ ] parts uninstall apache2 --version 2.4.6
• [ ] parts purge apache2 --version 2.4.6
• [ ] parts upgrade - upgrade all outdated installations
• [ ] parts cleanup - remove all unselected old versions

[petejkim]

wip

[petejkim]

putting this on hold for now, there are other problems with supporting multiple versions like /etc/*.conf files being incompatible between versions...