git-svn: --branch-all-refs / -B support
git-svn: --branch-all-refs / -B support

This should make life easier for all those who type:

	`git-rev-parse --symbolic --all | xargs -n1 echo -b`

every time they run git-svn fetch.

Signed-off-by: Eric Wong <8c2951295f8292b0c03727bc4652981172298eae@yhbt.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git