Update version number to 1.5.1

Restore version name in documentation

Version 1.4.rc1

https://github.com/cms-dev/cms/wiki/CMS-1.4.rc1-RELEASE-NOTES

Version 1.4.rc0

Version 1.3.2

https://github.com/cms-dev/cms/wiki/CMS-1.3.2-RELEASE-NOTES

Version 1.3.1

https://github.com/cms-dev/cms/wiki/CMS-1.3.1-RELEASE-NOTES

Version 1.3.0

https://github.com/cms-dev/cms/wiki/CMS-1.3.0-RELEASE-NOTES

Version 1.3.rc0

https://github.com/cms-dev/cms/wiki/CMS-1.3.rc0-RELEASE-NOTES

Version 1.2.0

https://github.com/cms-dev/cms/wiki/CMS-1.2.0-RELEASE-NOTES

Version 1.1.0

https://github.com/cms-dev/cms/wiki/CMS-1.1.0-RELEASE-NOTES