Update README links to be correct

The curl one doesn't work, since github redirects that URL and the -L
flag isn't passed in the example. Anyway, may as well just point people
at the URL where the file lives now.

Change-Id: I754e0145cff20aaae7af988b761429335152684b
Reviewed-on: http://gerrit.causes.com/40948
Reviewed-by: Joe Lencioni <joe.lencioni@brigade.com>
Tested-by: Joe Lencioni <joe.lencioni@brigade.com>