Merge pull request xtaci#74 from jinq0123/master

use heap.Fix() instead of Pop() and Push()

Merge pull request xtaci#74 from jinq0123/master

use heap.Fix() instead of Pop() and Push()

Merge pull request xtaci#65 from AudriusButkevicius/master

Add blacklist

remove the lock in rand

switch back upstream library, and keep the better xor

using copy to zero a slice is much more efficient in FEC

Merge pull request xtaci#55 from templexxx/master

替换 ec 库

compact a if-condition

hide some internal struct

add a precondition before heap operations