License MultiROM Mgr under GNU GPLv3

* CardUI and libsuperuser are licensed
  under (compatible) Apache 2.0 license
Merge pull request #7 from Asdamp/master

Italian traslation
[35] Check if all manifests are indeed JSON files to prevent crashes
[36] Show notification card if Ubuntu Touch is not supported
Untabify CardsUI
Add Slovak translation
Update strings.xml

Some updates and some translations forgotten,
Thank you,
Firmino Neto.
Merge pull request #8 from firneto/patch-2

Update strings.xml
Chinese Simplified traslation
update Chinese Simplified traslation
Merge pull request #9 from hpeng526/master

Chinese Simplified traslation
[37] Fix crash when saving InstallActivity
[38] Fix "done, go back" not doing anything in restored InstallActivity
[39] Add pull-to-refresh to MainActivity

* Using https://github.com/chrisbanes/Android-PullToRefresh
[40] Fix ByteArrayOutputStream leak in changelog download task
[41] Add "about" section and developer options to SettingsActivity
[42] Set developer options values when they are first activated
[43] Always setRefreshing(true) to PullToRefresh layout when refreshing
[44] Fix PullToRefresh layout being stuck in "refreshing"
[45] Add support for hammerhead and DTB