git-svn: documented --ignore-paths
git-svn: documented --ignore-paths

Documented --ignore-paths option of git-svn to inform users about
the feature and provide some examples.

Signed-off-by: Vitaly "_Vi" Shukela <public_vi@tut.by>
Acked-by: Eric Wong <normalperson@yhbt.net>

[ew: trailing whitespace removed]

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