add ubuntu platform
CB-5188:
Added amazon-fireos platform.
Change to use amazon-fireos as the platform if user agent string contains 'cordova-amazon-fireos'
[ubuntu] specify policy_group
added ubuntu support
[CB-5565] Updated version and RELEASENOTES.md for release 0.2.5
[CB-5565] Incremented plugin version on dev branch.
CB-5658 Delete stale snapshot of plugin docs
CB-5658 Add doc.index.md for netinfo plugin
CB-5658 Update license comment formatting of doc/index.md
CB-5719 Updated version and RELEASENOTES.md for release 0.2.6