* implements weighted round robin in init-sync
* protection against evil peer
* reshuffle
* shorten flag
* deterministic order of wrr
* Merge branch 'master' into init-sync-wrr
* Merge refs/heads/master into init-sync-wrr
* Merge refs/heads/master into init-sync-wrr
* allow peers with the same capacity to pe selected at random
* Merge branch 'init-sync-wrr' of github.com:prysmaticlabs/prysm into init-sync-wrr
* adds wrr to e2e tests
* Merge refs/heads/master into init-sync-wrr
* Merge refs/heads/master into init-sync-wrr
* Merge refs/heads/master into init-sync-wrr
* refactors block fetching function to fetcher
* more comments fixed
* Merge branch 'master' into init-sync-optimizations
* moves helper code into separate file
* move test setup code to testmain
* removes bench