Fixed issue when removing the Thymeleaf nature
Closes #45
Merge pull request #50 from tduchateau/2.1-dev

Fixed issue when removing the Thymeleaf nature
Merge branch '2.1-master' into 2.1-dev
Update changelog with fix for removing Thymeleaf natures.
Adjust changelog to emphasize split in 2.0 and 2.1 branches.
Fix for #47, switch from XPath expression to non-resolving SAX parser.
Update version number.
Create proposal and generator sub-packages.
Fixes #48, allow restrictions on attribute values.
Update changelog for #48.
Stop serving the older versions.
Set release date.
Update to Tycho 0.20.0, include versions plugin.