Merge pull request #14 from lemire/master

Optimization + inplace operations
Merge pull request #15 from willf/develop

Develop
Merge pull request #16 from lemire/master

Fixing various issues -- looks great
Merge pull request #17 from lemire/master

Various improvements
Merge pull request #18 from lemire/master

Speeding up trailing zero (iterators)
revert to go-only Count function
prepare 1.0.0 version
use popcnt if available on amd64
Merge pull request #19 from salviati/master

use popcnt if available on amd64
Fix popcnt_generic.go:22: too many arguments in call to popcntSliceGo
Merge pull request #20 from jwilder/master

Fix popcnt_generic.go:22: too many arguments in call to popcntSliceGo
Using faster popcnt function in pure Go