Add the removable media plugin

29.09.2016-17:03 < bartart3d> mhall119: so there are no configuration options in snapd to give it access to other
drives/partitions?
29.09.2016-18:30 < mhall119> boud: there's a "removable-media" plug you can add to the krita snap that will allow it to access files in external drives
29.09.2016-18:31 < mhall119> that will fix the problem bartart3d was having