Merge pull request #28 from howama/master

JENKINS-19770 Load initial configuration straight away
new theme
Create README.md
[maven-release-plugin] prepare release jenkinswalldisplay-0.6.21
Merge branch 'master' of github.com:jenkinsci/walldisplay-plugin
0.6.22-snapshot
[maven-release-plugin] prepare release jenkinswalldisplay-0.6.21
[maven-release-plugin] prepare for next development iteration