Auto merge of #229 - bluss:fix-macros, r=hauleth
Auto merge of #229 - bluss:fix-macros, r=hauleth

Fix num-macros for nightly

Now compatible with rustc 1.13.0-nightly (32571c05c 2016-09-17)

rust-num/num,rust-num/num-integer,DonSheddow/num,rust-lang/num,DonSheddow/num,vks/num,koverstreet/num,rust-num/num,koverstreet/num,rust-num/num-bigint,rust-lang/num,rust-num/num-bigint,rust-num/num-integer,rust-num/num-traits,vks/num,rust-num/num-traits