Change quoting of spaces to make AWS Auth work (#1199)
Change quoting of spaces to make AWS Auth work (#1199)

AWS Auth requires them to be quoted as '%20', but urllib's default (also used by requests) is '+'.
quiltdata/quilt,quiltdata/quilt,quiltdata/quilt,quiltdata/quilt,quiltdata/quilt-compiler,quiltdata/quilt-compiler,quiltdata/quilt-compiler,quiltdata/quilt,quiltdata/quilt-compiler