number: added number package

provides more styles and more control over
formatting than fmt.

Change-Id: Ib9d2c27db14804af911556e3caa8b35fddd32fce
Reviewed-on: https://go-review.googlesource.com/59812
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Nigel Tao <nigeltao@golang.org>
7 files changed