Merge branch 'master' of github.com:johanmattssonm/birdfont

Merge pull request #101 from City-busz/patch-1

Update AppStream metadata

Update AppStream metadata

- Specify launchable desktop file and developer name.
- Make metadata license more permissive to allow inclusion into distributions' AppStream database.

Merge branch 'master' of github.com:johanmattssonm/birdfont

Use https

Merge pull request #52 from henrich/master

fix AppStream info

update AppStream metadata

> $ appstreamcli validate resources/linux/birdfont.appdata.xml
> E - birdfont.appdata.xml:~:1
>    The metainfo file uses an ancient version of the AppStream specification, which
>    can not be validated. Please migrate it to version 0.6 (or higher).
>
> Validation failed: errors: 1

As https://www.freedesktop.org/software/appstream/docs/chap-Metadata.html#sect-Metadata-GenericComponent,
update it to current version.

Merge branch 'master' of gitorious.org:birdfont/birdfont

Add appdata file