Export variables for changing output
Export variables for changing output

When deciding what bits of output should be included in the status line,
the variables that configure this aren't exported, which means any
relevant configuration changes don't work.

Fixes #474.

ogr3/bash-git-prompt,magicmonty/bash-git-prompt,ogr3/bash-git-prompt,magicmonty/bash-git-prompt,ogr3/bash-git-prompt,magicmonty/bash-git-prompt