Merge pull request #16 from alexandervdm/master

Doesn't work against new tox-core
Fix test.
Fix missing variable in test.
Fix badge.
Fix issue #18
Fix test.
Remove uneeded GA tracking code.
Update travis libsodium version.
Added Dockerfile
Removed deprecated '--disable-dht-bootstrap-daemon'
Merge pull request #22 from ReAzem/patch-2

Removed deprecated '--disable-dht-bootstrap-daemon'
Added .PHONY and removed whitespaces
removed whitespace
Merge pull request #20 from ReAzem/master

Added Dockerfile
Sleep shorter time interval.
Update README
Update setup.py. Remove wheel packages.
Bump version to 0.0.22
Minor fix to documentation.
Update doc badges.