Change how command handler works

Signed-off-by: Ian Macalinao <me@ian.pw>
Fix ossrhUsername bugs

Signed-off-by: Ian Macalinao <me@ian.pw>
Merge branch 'master' of github.com:simplyianm/albkit
Fix signing stuff erroring if no signing key

Signed-off-by: Ian Macalinao <me@ian.pw>