Add RelNotes 1.5.1
Add RelNotes 1.5.1

Instead of running around listing the changes near the release,
let's keep things nicely organized by summarizing the changes as
we merge things to the 'master' branch.

I haven't decided how well this will go with people's patch
submission procedure yet --- we'll play it by the ear and see
what happens.

Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

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