imgbase: Fix bootloader class introduction

Signed-off-by: Fabian Deutsch <fabian.deutsch@gmx.de>
Ignore more files

Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>
Add prupose to readme

Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>
imgbase: Class for external commands

Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>
imgbase: Add disk usage

Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>
imgbase: Use Mount class

Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>
imgbase: Fix add_base()

Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>