Auto merge of #125 - IvanUkhov:real-arithmetic, r=cuviper
Auto merge of #125 - IvanUkhov:real-arithmetic, r=cuviper

Implement arithmetic with real for complex

Hello,

It might be handy to be able to perform basic arithmetic operations in expressions mixing complex numbers and numeric primitives; see #116. I would be grateful for any feedback, especially regarding the subsets of primitives for which certain operations are implemented.

Regards,
Ivan

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